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 A027162 #4 Mar 30 2012 18:56:14 %S A027162 4,15,112,440,3328,13552,103168,429696,3282944,13882880,106307584, %T A027162 454471680,3485499392,15022878720,115345653760,500317061120, %U A027162 3844727111680,16761479102464,128891635105792,564250624917504,4341301000536064 %N A027162 a(n) = T(2n-1,n-2), T given by A027157. %K A027162 nonn %O A027162 2,1 %A A027162 _Clark Kimberling_