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 A294314 #10 Mar 27 2019 10:01:45
%S A294314 0,1,1,5,0,64,-245,2757,-23576,272256,-3270977,45055845,-671589952,
%T A294314 10984688636,-193875825117,3688182769117,-75085512079184,
%U A294314 1630385857436224,-37596306847103457,917765946045581357,-23641953753495247624,640958728426947233468,-18242640219843554954221
%N A294314 Expansion of e.g.f. log(1 + x*sec(x))*exp(x).
%e A294314 log(1 + x*sec(x))*exp(x) = x/1! + x^2/2! + 5*x^3/3! + 64*x^5/5! - 245*x^6/6! + ...
%p A294314 a:=series(log(1+x*sec(x))*exp(x),x=0,23): seq(n!*coeff(a,x,n),n=0..22); # _Paolo P. Lava_, Mar 27 2019
%t A294314 nmax = 22; CoefficientList[Series[Log[1 + x Sec[x]] Exp[x], {x, 0, nmax}], x] Range[0, nmax]!
%Y A294314 Cf. A009334, A009371, A009442, A009843, A295278, A296336, A296436, A296438, A297206.
%K A294314 sign
%O A294314 0,4
%A A294314 _Ilya Gutkovskiy_, Dec 27 2017