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 A294340 #8 Oct 29 2017 11:09:43
%S A294340 1,-1,1,-3,15,-75,435,-3045,29505,-305865,3193785,-36542835,501892335,
%T A294340 -7286043555,108056360475,-1793622856725,32996752625025,
%U A294340 -620276725767825,11975531764755825,-249801487147455075,5592450521376068175,-130966142569782327675
%N A294340 E.g.f.: exp(Sum_{n>=1} A081362(n)*x^n/n).
%H A294340 Seiichi Manyama, <a href="/A294340/b294340.txt">Table of n, a(n) for n = 0..444</a>
%F A294340 a(0) = 1 and a(n) = (n-1)! * Sum_{k=1..n} A081362(k)*a(n-k)/(n-k)! for n > 0.
%Y A294340 Cf. A294261.
%K A294340 sign
%O A294340 0,4
%A A294340 _Seiichi Manyama_, Oct 28 2017