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 A134140 #4 Apr 14 2023 15:33:08
%S A134140 1,5,25,95,-275,-14755,-278795,-4134145,-49014215,-304537195,
%T A134140 7111142545,397535340575,12667519999525,327297915798125,
%U A134140 7052174242084525,109425656597938175,-88497453300450575,-107470322009554282075,-6297063330456696598775
%N A134140 Alternating row sums of triangle A049374 (S1p(6)).
%F A134140 a(n) = Sum_{m=1..n} A049374(n,m)*(-1)^(m-1), n>=1.
%F A134140 E.g.f.: 1-exp(-(1-(1-x)^5)/(5*(1-x)^5)). Cf. e.g.f. first column of A049374.
%Y A134140 Cf. A049402 (row sums of A049374).
%K A134140 sign,easy
%O A134140 1,2
%A A134140 _Wolfdieter Lang_ Oct 12 2007