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 A232972 #3 Dec 05 2013 21:46:41 %S A232972 1,5,46,497,5746,68948,846889,10570001 %N A232972 Main diagonal of array P(i,j) mentioned in A064642. %Y A232972 Cf. A064642, A064641. %K A232972 nonn,more %O A232972 0,2 %A A232972 _N. J. A. Sloane_, Dec 05 2013