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 A263264 #5 Nov 09 2015 16:14:29 %S A263264 7,17,24,72,87,98,139,141,142,150,202,208,225,228,297,338,340,371,372, %T A263264 375,386,388,408,420,424,432,502,506,537,539,542,550,625,644,660,680, %U A263264 684,698,712,732,804,818,822,824,926,948,952,967,968,971,973,976,990,1056,1062,1120,1122 %N A263264 Row 4 of A263255. %C A263264 Numbers n for which A263254(n) = 4. Numbers that are four edges removed from the infinite trunk (A259934) of the tree defined by edge-relation A049820(child) = parent. %H A263264 Antti Karttunen, <a href="/A263264/b263264.txt">Table of n, a(n) for n = 1..1023</a> %o A263264 (Scheme, with _Antti Karttunen_'s IntSeq-library) %o A263264 (define A263264 (MATCHING-POS 1 0 (lambda (n) (= 4 (A263254 n))))) %Y A263264 Cf. A049820, A259934, A263254, A263255. %K A263264 nonn %O A263264 1,1 %A A263264 _Antti Karttunen_, Nov 07 2015