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 A263263 #6 Nov 09 2015 16:14:21 %S A263263 5,8,13,15,16,20,40,50,56,60,83,85,92,134,137,138,198,204,216,268,272, %T A263263 289,292,308,312,328,332,344,348,360,367,382,392,396,412,416,436,438, %U A263263 498,533,538,620,632,636,640,664,666,694,700,704,720,776,792,814,816,828,922,936,940,956,965,966,969,1032 %N A263263 Row 3 of A263255. %C A263263 Numbers n for which A263254(n) = 3. Numbers that are three edges removed from the infinite trunk (A259934) of the tree defined by edge-relation A049820(child) = parent. %H A263263 Antti Karttunen, <a href="/A263263/b263263.txt">Table of n, a(n) for n = 1..2047</a> %o A263263 (Scheme, with _Antti Karttunen_'s IntSeq-library) %o A263263 (define A263263 (MATCHING-POS 1 0 (lambda (n) (= 3 (A263254 n))))) %Y A263263 Cf. A049820, A259934, A263254, A263255. %K A263263 nonn %O A263263 1,1 %A A263263 _Antti Karttunen_, Nov 07 2015