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 A144283 #5 Jul 03 2023 14:52:33 %S A144283 1,3,30,321,4788,84483,1892835,48681864,1471877946,50200415496, %T A144283 1925842959810,81617639962320,3796524406060155,191934556035324795, %U A144283 10484757631267725960,615052198937234606625,38564916668583937458750,2573353724722205851069875 %N A144283 Third column (m=3) of triangle S2hat(-3) = A144280. %F A144283 a(n) = A144280(n+3,3), n>=0. %Y A144283 Cf. A144280, A144282 (m=2 column). %K A144283 nonn,easy %O A144283 0,2 %A A144283 _Wolfdieter Lang_, Oct 09 2008