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 A144352 #6 Jul 04 2023 13:06:13 %S A144352 1,1,3,9,36,166,968,6372,49368,429240,4198176,45268416,535590144, %T A144352 6879038400,95412176640,1419918128640,22571960048640,381596438638080, %U A144352 6836248502784000,129352329079142400,2577689266340966400,53957785094515814400,1183674698660605132800 %N A144352 Third column (m=3) of triangle A144351. %F A144352 a(n) = A144351(n+3,3), n>=0. %Y A144352 Cf. A144351, A000142 (column m=1). Column m=2 looks like A024419. %K A144352 nonn,easy %O A144352 0,3 %A A144352 _Wolfdieter Lang_, Oct 09 2008