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 A335750 #11 Jun 21 2020 06:01:57 %S A335750 1,1,1,2,4,8,11056,32,231488,5614976,44700416,39773696,242036829184, %T A335750 1347442688,13896827482112,14116194346606592,126309515939299328, %U A335750 4968569161351168,1724597636500912693116928,20212640119738990592,68441268157533158650937344,796968953534517505001259008 %N A335750 a(n) = numerator(Bernoulli(2*n)*(1/2 - n)! / sqrt(Pi)). %F A335750 a(n) = numerator(-2*n*Zeta(1 - 2*n)*(1/2 - n)! / sqrt(Pi)) for n >= 1. %e A335750 r(n) = 1/2, 1/6, 1/15, 2/63, 4/225, 8/693, 11056/1289925, 32/4455, ... %p A335750 a := n -> bernoulli(2*n)*(1/2 - n)! / sqrt(Pi): %p A335750 seq(numer(simplify(a(n))), n = 0..21); %Y A335750 Cf. A335751 (denominator), A000367/A002445, A004193. %K A335750 nonn,frac %O A335750 0,4 %A A335750 _Peter Luschny_, Jun 20 2020