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 A263269 #10 Dec 03 2015 04:35:26 %S A263269 0,2,6,12,18,22,30,34,42,46,54,58,66,70,80,88,94,102,112,116,126,124, %T A263269 130,138,150,148,160,158,164,184,190,194,210,214,222,234,252,246,250, %U A263269 258,266,272,296,312,306,320,328,340,352,364,372,354,358,368,384,392,408,402,414,418,426,434,448,460,462,470,474,486,496,510,522,530,546,558,562,566,574,582,592,598,606,630 %N A263269 The right edge of irregular table A263267. %H A263269 Antti Karttunen, <a href="/A263269/b263269.txt">Table of n, a(n) for n = 0..10001</a> %F A263269 a(n) = A263267(A263260(n)-1). %F A263269 Other identities. For all n >= 0: %F A263269 A155043(a(n)) = n. %F A263269 a(A262508(n)) = A262509(n) = A264988(A262508(n)). [In case A262508 and A262509 are infinite sequences.] %Y A263269 Cf. A000005, A049820, A155043, A262508, A262509, A262686, A263260, A263267. %Y A263269 Cf. A264988 (the other edge). %K A263269 nonn %O A263269 0,2 %A A263269 _Antti Karttunen_, Nov 29 2015