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 A295278 #28 Mar 27 2019 10:02:49
%S A295278 0,1,1,-1,0,4,-5,13,-392,2112,7663,-165067,1011560,-2965756,-11164309,
%T A295278 630876517,-12760548400,133046910432,-189966787521,-18567623055795,
%U A295278 392188656574896,-5061972266268844,33655544331988203,565132153437469165,-26647451471277927416
%N A295278 Expansion of e.g.f. log(1 + x*sech(x))*exp(x).
%e A295278 log(1 + x*sech(x))*exp(x) = x/1! + x^2/2! - x^3/3! + 4*x^5/5! - 5*x^6/6! + ...
%p A295278 a:=series(log(1+x*sech(x))*exp(x),x=0,25): seq(n!*coeff(a,x,n),n=0..24); # _Paolo P. Lava_, Mar 27 2019
%t A295278 nmax = 24; CoefficientList[Series[Log[1 + x Sech[x]] Exp[x], {x, 0, nmax}], x] Range[0, nmax]!
%Y A295278 Cf. A009353, A009390, A009443, A009843, A294314, A296336, A296437, A296439, A297206.
%K A295278 sign
%O A295278 0,6
%A A295278 _Ilya Gutkovskiy_, Dec 27 2017