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 A009393 #15 Nov 29 2024 17:33:55
%S A009393 0,1,-3,6,-8,5,-7,70,-72,-1311,1309,49214,-49216,-2653547,2653545,
%T A009393 196707438,-196707440,-19194804703,19194804701,2385684870742,
%U A009393 -2385684870744,-367985503366779,367985503366777,68980888889771126,-68980888889771128
%N A009393 Expansion of e.g.f. log(1+tanh(x))/exp(x).
%t A009393 nmax=24; CoefficientList[Series[Log[1+Tanh[x]]/Exp[x],{x,0,nmax}],x]Range[0,nmax]! (* _Stefano Spezia_, Nov 29 2024 *)
%K A009393 sign,easy
%O A009393 0,3
%A A009393 _R. H. Hardin_
%E A009393 Extended with signs by _Olivier Gérard_, Mar 15 1997