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 A144882 #6 Jul 03 2023 10:06:16
%S A144882 1,4,16,85,481,3352,25420,223393,2157565,23241244,272933680,
%T A144882 3496821133,48307202761,717473918560,11381186498836,192155770419673,
%U A144882 3438337498017781,65004294514876996,1294456866053992600,27081588485949257605
%N A144882 Row sums of triangle A144881 (S1hat(3)) and of array A144880 (M31hat(3)).
%F A144882 a(n) = Sum_{m=1..n} A144881(n,m), n>=1.
%Y A144882 Cf. A144880, A144881.
%K A144882 nonn,easy
%O A144882 1,2
%A A144882 _Wolfdieter Lang_, Oct 09 2008