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 A134139 #2 Mar 31 2012 13:20:14 %S A134139 1,4,16,44,-244,-7336,-112664,-1406336,-14058944,-66627136,1879992896, %T A134139 85070733824,2359547577856,54106723270144,1055100890838016, %U A134139 15611883969810944,48348082318102016,-9055743653514520576,-521351156412528902144 %N A134139 Alternating row sums of triangle A049353 (S1p(5)). %F A134139 a(n)=sum(A049353(n,m)*(-1)^(m-1),m=1..n), n>=1. %F A134139 E.g.f.: 1-exp(-x*(2-x)*(2-2*x+x^2)/(4*(1-x)^4)). Cf. e.g.f. first column of A049353. %Y A134139 Cf. A049378 (row sums of A049353). %K A134139 sign,easy %O A134139 1,2 %A A134139 _Wolfdieter Lang_ Oct 12 2007