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 A123311 #6 Jan 13 2025 04:10:19 %S A123311 1,2,18,336,10050,423576,23317042,1595336448,131036683554, %T A123311 12595263510000,1389395816978554,173214827643727872, %U A123311 24105386508556401906,3706800170875348334480,624528505602985043491650 %N A123311 Central terms of triangle A123305. %C A123311 Triangle T=A123305 is defined by: (column k of T) = (k+1)*(column k of T^2) shifted to have an initial '1'; thus A123312(n) = a(n)/(n+1) is an integer for n>=0. %Y A123311 Cf. A123305; A123306, A123307, A123308, A123309, A123310, A123312. %K A123311 nonn,more %O A123311 0,2 %A A123311 _Paul D. Hanna_, Sep 25 2006