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 A063181 #3 Mar 02 2015 16:08:46 %S A063181 1,0,1,2,1,0,0,2,3,4,12,10,7,4,0,0,12,22,31,38,42,178,166,144,115,80, %T A063181 42,0,0,178,344,500,637,748,828,870,4830,4652,4308,3820,3205,2488, %U A063181 1698,870,0,0,4830,9482,13968,18132 %N A063181 The array of A063179 read by diagonals in the 'up' direction. %Y A063181 Cf. A063179, A063180. %K A063181 easy,nonn,tabl %O A063181 1,4 %A A063181 _Floor van Lamoen_, Jul 09 2001