the product of a few afternoons spent trawling strange corners of the Online Encyclopedia of Integer Sequences, presented here, in no particular order:

A230052 - Years in which the winner of the United States presidential election lost the popular vote

A224711 - Number of ballot results from *n* voters that prompt a run-off election when three candidates vie for two spots on a board

A125524 - Republican primes (or Tory primes, if you’re in the UK)

A247385 - erroneous decimal expansion of pi on wall of Robertson Tunnel, Washington Park, Portland, OR

A000053 and A000054 - stops on the 1 and A lines, NYC subway

A080992 - entries in Durer’s magic square ‘Melancolia’

A261903 - Sequence found in Pablo Picasso’s work “Poème: Mathématiquement pure image illusoire du ronflement écoeurant …”

A086746 - Borges, the tortoise and the hare

A157989 - numbers sung in a jingle for a Canadian pizza chain, Pizza Pizza

A111729 - progression of years in the song ‘In the Year 2525’

A145330 - Star Wars theme melody

A118131 - profile of a woman, by JP David

A173035 - cat years to human years

A103742 - number of letters in Turkish days of the week

A335974 - number of tieless games for a Quidditch game with *n* scoring events

A250023 - ‘The problem of extracting this cube root pitted an abacus salesman against Nobel Prize winning physicist Richard Feynman one afternoon in Rio de Janeiro.’

A133580 - ‘This was inspired by the fact that our universe seems to be 73% Dark Energy, 23% Dark Matter and 4% ordinary matter, where 73 is prime, 23 is prime, 4 is semiprime.’

A188166 - NYC streets that are 100 ft wide instead of 60 ft

A102876 - two-way NYC cross-town streets

A200066 - numbers listed on the Lebombo bone

A210621 - the Rhind papyrus; squaring a circle; the Egyptian approximation of pi

A320467 - Mayan calendar cycle

A201186 - Robert Recorde’s Whetstone of Whit