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 A151392 #15 May 08 2017 16:29:35 %S A151392 1,2,12,100,980,10584,121968,1472328,18404100,236390440,3103161776, %T A151392 41469525552,562496897872,7726605740000,107289439704000, %U A151392 1503840313184400,21252802073091300 %N A151392 Duplicate of A000888. %K A151392 dead %O A151392 0,2