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 A091750 #3 Oct 12 2012 14:40:20 %S A091750 1,19,1171,151681,33743041,11461272931,5499378001699,3524209981309921, %T A091750 2887597622445729121,2916075074262560119891,3507033649107862877516371, %U A091750 4836904652902464306386484769,7251193844710136332044143616481 %N A091750 Alternating row sums of array A091746 (generalized Stirling2 array (6,2)). %C A091750 The first negative term is the 41 digit number a(16)=-42686874251433290891296448926053802610879. %F A091750 a(n)=sum(A091746(n, k)*(-1)^k, k=2..2*n), n>=1. %Y A091750 Cf. A091748 (row sums of A091746). %K A091750 sign,easy %O A091750 1,2 %A A091750 _Wolfdieter Lang_, Feb 27 2004