%I #8 Nov 09 2015 16:08:34
%S 1,9,10,25,26,28,38,49,52,66,68,74,76,80,82,110,112,122,124,126,127,
%T 131,133,156,168,169,170,172,176,178,180,188,218,226,234,238,258,278,
%U 288,290,300,304,306,316,318,322,334,361,362,368,398,414,422,448,452,470,478,496,514,518,526,586
%N Row 1 of A263255.
%C Numbers n for which A263254(n) = 1. Numbers that are one edge removed from the infinite trunk (A259934) of the tree defined by edge-relation A049820(child) = parent.
%H Antti Karttunen, <a href="/A263261/b263261.txt">Table of n, a(n) for n = 1..10000</a>
%o (Scheme, with _Antti Karttunen_'s IntSeq-library)
%o (define A263261 (MATCHING-POS 1 0 (lambda (n) (= 1 (A263254 n)))))
%Y Cf. A049820, A259934, A263254, A263255.
%Y Cf. also A262901.
%K nonn
%O 1,2
%A _Antti Karttunen_, Nov 07 2015