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 A144347 #8 Jul 04 2023 08:18:17 %S A144347 1,12,192,3960,100656,3048192,107255232,4302305280,193836779136, %T A144347 9693022090752,532784148728832,31930395433896960,2072320885985366016, %U A144347 144803002560595771392,10838696766561262190592,865256088684973495910400,73383436891415208719056896 %N A144347 Second column (m=2) of triangle S2p(-4) = A011801. %F A144347 a(n) = A011801(n+2,2), n>=0. %Y A144347 Cf. A011801, A008546(n-1) (m=1 column), A144348 (m=3 column). %K A144347 nonn,easy %O A144347 0,2 %A A144347 _Wolfdieter Lang_, Oct 09 2008