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 A354491 #6 May 31 2022 06:50:15 %S A354491 0,0,0,0,4,0,6,8,18,0,62,0,48,88,77,0,203,0,265,209,140,0,628,118,199, %T A354491 301,614,0,1285,0,639,583,364,733,2051,0,467,836,2275,0,2923,0,1720, %U A354491 2597,704,0,4558,599,2427,1491,2454,0,4449,2021,5008,1895,1146,0,11618 %N A354491 Diagonal of the triangle A354490. %C A354491 Apparently, a(n) = 0 for prime n. %F A354491 a(n) = A354490(n, n). %Y A354491 See A353532 and A354490 for more information. %Y A354491 Cf. A353447. %K A354491 nonn %O A354491 2,5 %A A354491 _Hugo Pfoertner_, May 30 2022