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 A171001 #3 Aug 02 2014 06:11:56 %S A171001 1,0,1,4,9,9,36,100,225,400,1225,3136,7056,15876,44100,108900,245025, %T A171001 627264,1656369,4008004,9018009,25050025,64128064,153165376,344622096, %U A171001 1012766976,2538950544,6009350400,13521038400,41408180100,102252852900,240407818596 %N A171001 Binomial(n-k,k)^2 where k = ceiling(n/4). %Y A171001 A lower bound for A094837. Cf. A171002, A171003, A171006. %K A171001 nonn %O A171001 0,4 %A A171001 _John P. Linderman_, Aug 31 2010