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 A134272 #6 Sep 25 2024 09:43:55
%S A134272 1,3,25,239,3289,53111,1031497,22906903,578734697,16306214743,
%T A134272 508360540457,17354157283287,644314385719593,25842490815894231,
%U A134272 1113789927340848937,51332921853722842327,2519491205735072674601
%N A134272 Alternating row sums of triangle A134151.
%F A134272 a(n) = Sum_{m=1..n} A134151(n,m)*(-1)^(m-1), n>=1.
%Y A134272 Cf. A134152 (row sums of triangle A134151).
%K A134272 nonn,easy
%O A134272 1,2
%A A134272 _Wolfdieter Lang_, Nov 13 2007