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 A187233 #6 Mar 30 2012 18:57:19 %S A187233 2,4,6,8,10,12,14,17,18,21,22,25,27,29,31,33,35,37,40,42,43,45,48,50, %T A187233 52,54,56,58,60,63,65,67,68,71,73,75,77,79,81,83,86,88,90,92,94,96,98, %U A187233 100,102,104,106,109,111,113,115,117,119,121,123,125,127,129,132,134,136,138,140,142,144,146,148,150,152,155,157,159,161,163,165,167,169,171,173,175,178,180 %N A187233 Complement of A187232. %C A187233 See A187224. A187233(n)=A187908(n) for n=1,2,...,18; A187233(19)=40 and A187908(19)=39. %t A187233 (See A187232.) %Y A187233 Cf. A187224, A187232. %K A187233 nonn %O A187233 1,1 %A A187233 _Clark Kimberling_, Mar 07 2011