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 A077173 #5 Dec 05 2013 19:55:49 %S A077173 2,1,3,7,11,15,22,29,37,44,56,67,78,92,106,119,136,154,171,188,210, %T A077173 230,252,275,299,323,349,375,402,430,460,491,522,555,588,623,658,694, %U A077173 731,769,809,849,890,932,975,1019,1064,1110,1157,1205,1255 %N A077173 Initial terms of rows of triangle in A077172. %Y A077173 Cf. A077172, A077174, A077175, A077176, A100918. %K A077173 nonn %O A077173 1,1 %A A077173 _Amarnath Murthy_, Nov 01 2002 %E A077173 Extended by _Ray Chandler_, Nov 29 2004