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 A158280 #5 Jun 17 2012 12:23:40 %S A158280 7,21,21,21,42,21,21,63,21,21,63,21,42,70,21,21,63,63,21,63,21,21,126, %T A158280 21,42,63,21,63,63,21,21,126,63,21,63,21,21,126,63,21,105,21,63,63,21, %U A158280 63,63,63,21,126,21,21,189,21,21,63,21,63,126,63,42,63,70,21,63,21,63,210,21,21 %N A158280 Octosection: A145511(8n+4) or A145501(8n+4). %C A158280 All entries are multiples of 7, cf. A158315. %K A158280 nonn,less %O A158280 0,1 %A A158280 _Paul Curtz_, Mar 15 2009 %E A158280 Edited and extended by _R. J. Mathar_, Apr 04 2009