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 A071883 #3 Mar 30 2012 16:49:26 %S A071883 0,2,1,6,2,9,2,12,3,20,6,25,6,20,3,20,4,35,12,56,15,56,10,49,10,56,15, %T A071883 56,12,35,4,30,5,54,20,99,28,110,21,110,24,143,40,156,35,108,14,81,14, %U A071883 108,35,156,40,143,24,110,21,110,28,99,20 %N A071883 A002487(n)*A002487(n+2). %Y A071883 Cf. A002487, A070871. %K A071883 nonn %O A071883 0,2 %A A071883 _N. J. A. Sloane_, Jun 10 2002