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 A171002 #3 Aug 02 2014 06:11:56 %S A171002 0,0,0,3,0,6,40,150,100,525,1960,5880,7056,26460,83160,228690,365904, %T A171002 1189188,3435432,9018009,17177160,51531480,141581440,361032672, %U A171002 773641440,2204878104,5859116640,14647791600,34178180400,93989996100,243891989880,601019546490 %N A171002 Binomial(n-k,k) * binomial(n-k-1,k+1) where k = ceiling(n/4). %Y A171002 Cf. A171001, A171003, A171006. %K A171002 nonn %O A171002 1,4 %A A171002 _John P. Linderman_, Sep 01 2010