This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A333934 #14 Jun 13 2021 03:23:50 %S A333934 1,1,2,2,8,8,132,272,1844,7824,219392,879040,9865488,30363264, %T A333934 1348905760,26759363296,265338415104,1871331759456,24675601835904, %U A333934 166652846570112,1969110048305664,22090834149738048,2586719545294006272,22961806952814951168,289429435718440962048 %N A333934 Number of permutations of [n] such that the product of the first k elements and the product of the last k elements are multiples of k for all k in [n]. %H A333934 Wikipedia, <a href="https://en.wikipedia.org/wiki/Permutation">Permutation</a> %e A333934 a(5) = 8: 12345, 14325, 14352, 21345, 25341, 52341, 54312, 54321. %Y A333934 Cf. A333711, A333892. %K A333934 nonn %O A333934 0,3 %A A333934 _Alois P. Heinz_, Apr 10 2020