%I #9 Feb 21 2015 23:04:31
%S 0,1,2,3,5,6,7,9,11,13,14,15,16,18,21,23,25,27,29,30,31,32,34,37,39,
%T 42,45,47,48,50,53,55,57,59,61,62,63,64,66,69,71,74,76,78,81,84,87,90,
%U 93,95,96,98,101,103,106,109,111,112,114,117,119,121,123,125,126,127
%N The trunk of number-of-runs beanstalk, halved: a(n) = A255056(n)/2.
%H Antti Karttunen, <a href="/A255057/b255057.txt">Table of n, a(n) for n = 0..16142</a>
%F a(n) = A255056(n)/2.
%F a(n) = A255067(A255122(n)).
%o (Scheme, two versions)
%o (define (A255057 n) (/ (A255056 n) 2))
%o (define (A255057 n) (A255067 (A255122 n)))
%Y First differences: A255337.
%Y Characteristic function: A255339.
%Y Cf. A255056, A255058, A255067, A255122, A255125, A255126, A255328, A255329, A255330, A255338.
%K nonn
%O 0,3
%A _Antti Karttunen_, Feb 14 2015