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 A134148 #6 Sep 25 2024 09:43:28
%S A134148 1,2,13,83,817,9065,121795,1850384,31964686,612859952,12980965588,
%T A134148 300358150373,7548024748057,204624140789585,5954693801179750,
%U A134148 185127523366125449,6124428454164394921,214815152433502078607
%N A134148 Alternating row sums of triangle A134146.
%F A134148 a(n) = Sum_{m=1..n} A134146(n,m)*(-1)^(m-1), n>=1.
%Y A134148 Cf. A134147 (row sums of A134146).
%K A134148 nonn,easy
%O A134148 1,2
%A A134148 _Wolfdieter Lang_, Nov 13 2007