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 A144343 #5 Jul 03 2023 12:43:33
%S A144343 1,6,61,1021,22801,654271,22642171,922787096,43149037646,
%T A144343 2279170742696,134100508257596,8698551285481371,616549939781495121,
%U A144343 47409430650407225871,3930455865337807339246,349471231024984588597871,33172028312913149756842121
%N A144343 Row sums of triangle A144342 (called S2hat(-5)).
%F A144343 a(n) = Sum_{m=1..n} A144342(n,m), n>=1.
%Y A144343 Cf. A144342.
%K A144343 nonn,easy
%O A144343 1,2
%A A144343 _Wolfdieter Lang_, Oct 09 2008