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 A181889 #13 Mar 30 2012 16:51:59 %S A181889 0,64,784,4368,16368,48048,119392,262752,527136,983136,1728496, %T A181889 2894320,4651920,7220304,10874304,15953344,22870848,32124288,44305872, %U A181889 60113872,80364592,106004976,138125856,177975840,226975840,286734240,359062704,445992624,549792208,672984208,818364288,989020032,1188350592,1420086976,1688312976,1997486736,2352462960,2758515760,3221362144,3747186144 %N A181889 Bisection of A181888. %C A181889 These are scaled central factorial numbers. %Y A181889 A bisection of A181888. Cf. A001823. %K A181889 nonn %O A181889 1,2 %A A181889 _N. J. A. Sloane_, Feb 01 2011