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 A171006 #3 Aug 02 2014 06:11:56 %S A171006 0,0,0,1,6,1,12,60,200,150,700,2450,7056,8820,31752,97020,261360, %T A171006 426888,1359072,3864861,10020010,19324305,57257200,155739584, %U A171006 393853824,851005584,2405321568,6347376360,15774544800,37026362100,101219995800,261312846300 %N A171006 Binomial(n-k-1,k) * binomial(n-k,k+1) where k = ceiling(n/4). %Y A171006 Another lower bound for A094837. Cf. A171001, A171002, A171003. %K A171006 nonn %O A171006 0,5 %A A171006 _John P. Linderman_, Sep 02 2010