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 A061578 #1 May 16 2003 03:00:00 %S A061578 1,4,5,6,8,9,10,11,13,14,15,16,17,19,20,21,22,23,24,25,27,28,29,30,31, %T A061578 32,33,34,36,37,38,39,40,41,42,43,44,46,47,48,49,50,51,52,53,54,55,57, %U A061578 58,59,60,61,62,63,64,65,66,67,68,70,71,72,73,74,75,76,77,78,79,80,81 %N A061578 First differences of A061577. %Y A061578 Cf. A005228, A061577. %K A061578 nonn,easy %O A061578 1,2 %A A061578 Ronald van Eijck (eequalsmcsquare(AT)hotmail.com), May 21 2001 %E A061578 More terms from Larry Reeves (larryr(AT)acm.org), Jun 12 2001