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 A294531 #11 Nov 23 2017 21:33:07
%S A294531 1,1,2,7,28,141,866,6063,48560,438721,4387582,48272643,579642328,
%T A294531 7535456657,105499762356,1582665820557,25322712724800,430488412249937,
%U A294531 7748929638924950,147229720951176075,2944597048114831688,61836721841638907121,1360407969674984670156
%N A294531 E.g.f.: 1/Product_{k>0} (1-x^(2*k-1)/(2*k-1)!).
%H A294531 Robert Israel, <a href="/A294531/b294531.txt">Table of n, a(n) for n = 0..449</a>
%p A294531 N:= 40:
%p A294531 S:= series(1/mul(1-x^j/j!,j=1..N,2),x,N+1):
%p A294531 seq(coeff(S,x,n)*n!,n=0..N); # _Robert Israel_, Nov 23 2017
%t A294531 nmax = 30; CoefficientList[Series[1/Product[(1-x^(2*k-1)/(2*k-1)!), {k, 1, nmax}], {x, 0, nmax}], x] * Range[0, nmax]! (* _Vaclav Kotesovec_, Nov 02 2017 *)
%Y A294531 Cf. A005651, A032310.
%K A294531 nonn
%O A294531 0,3
%A A294531 _Seiichi Manyama_, Nov 02 2017