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 A090437 #5 Dec 27 2023 21:18:59
%S A090437 1,1,-17,-299,1921,451621,23016631,-138672407,-208026131039,
%T A090437 -31455532865879,-2214855733827329,358045039222582141,
%U A090437 197933737480453452193,51028310360637930765901,6769736050165112232649351,-1644881699523140953828119599
%N A090437 Alternating row sums of array A078740 ((3,2)-Stirling2).
%F A090437 a(n) = Sum_{k=2..2*n} A078740(n, k)*(-1)^k, n>=1.
%Y A090437 Cf. A078740.
%K A090437 sign,easy
%O A090437 1,3
%A A090437 _Wolfdieter Lang_, Dec 23 2003