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 A169759 #2 Mar 30 2012 16:51:44 %S A169759 0,1,6,24,96,372,1476,5880,23472,93792,374964,1499424 %N A169759 Sum of terms in n-th row of A151724 when that sequence is written as a triangle. %C A169759 I wish I had a recurrence for this sequence! %Y A169759 Cf. A151724, A169760. %K A169759 nonn %O A169759 0,3 %A A169759 _N. J. A. Sloane_, May 06 2010