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 A262892 #12 Jul 23 2025 15:35:34 %S A262892 1,3,4,6,8,10,15,16,18,21,30,31,32,36,37,39,44,45,49,50,51,53,54,55, %T A262892 58,60,62,65,68,71,72,73,74,75,76,80,83,84,90,91,93,96,109,112,117, %U A262892 122,123,124,126,127,131,134,135,137,141,142,144,145,147,149,152,154,155,161,162,165,166,170,178,187,189,190,191,193,195,199,201,203,205,211,212,213,219,223,225 %N A262892 Indices of nonbranching nodes in the infinite trunk (A259934) of the tree generated by edge-relation A049820(child) = parent. %C A262892 Positions of zeros in A262890. Positions of ones in A262891. %C A262892 Sequence b(n) = A262508(n)-1 = 9235, 9236, 9237, 9246, 9247, 9329, 9330, 9352, 9355, ..., is a subsequence. %H A262892 Antti Karttunen, <a href="/A262892/b262892.txt">Table of n, a(n) for n = 1..4085</a> %F A262892 Other identities. For all n >= 1: %F A262892 A262897(n) = A259934(a(n)) = A262896(a(n)). %o A262892 (Scheme, with _Antti Karttunen_'s IntSeq-library) %o A262892 (define A262892 (ZERO-POS 1 0 (COMPOSE -1+ A262891))) %Y A262892 Cf. A049820, A259934, A262890, A262891, A262896. %Y A262892 Cf. A262897 (nonbranching nodes themselves). %Y A262892 Cf. A262508. %K A262892 nonn %O A262892 1,2 %A A262892 _Antti Karttunen_, Oct 04 2015