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 A144286 #5 Jul 03 2023 14:52:53
%S A144286 1,5,41,561,10281,243481,6965401,235103417,9112789817,399330154617,
%T A144286 19502558109177,1050527843743993,61855087724349433,
%U A144286 3952225158444979193,272326955744655069689,20128716335079745234425,1588573078022351774367225,133323969310853649963402745
%N A144286 Row sums of triangle A144285 (called S2hat(-4)).
%F A144286 a(n) = Sum_{m=1..n} A144285(n,m), n>=1.
%Y A144286 Cf. A144285.
%K A144286 nonn,easy
%O A144286 1,2
%A A144286 _Wolfdieter Lang_, Oct 09 2008