%I #7 Nov 29 2016 22:39:55
%S 1,3,4,1,3,4,2,2,4,1,4,3,2,2,4,3,2,3,1,3,4,2,3,3,3,3,2,2,3,3,1,3,4,2,
%T 3,3,2,2,4,2,3,4,3,4,1,4,3,2,3,3,3,3,2,2,2,4,3,2,3,2,2,4,1,3,4,2,2,4,
%U 3,3,3,3,4,2,3,3,3,3,3,4,3,1,3,4,2,3,4,3,4,2,3,3,3,2,3,3,2,3,2,3,3,3,3,2,1,3,4,2,3,3,2,3,3,2,3,3,3,1,4,3,2
%N First differences of A278517; run lengths in A260731.
%H Antti Karttunen, <a href="/A278518/b278518.txt">Table of n, a(n) for n = 0..11363</a>
%F a(n) = A278517(1+n) - A278517(n).
%F a(n) = 1 + (A278519(n) - A278517(n)).
%F a(n) = 1 + A278521(n) + A278522(n).
%o (Scheme)
%o (define (A278518 n) (- (A278517 (+ 1 n)) (A278517 n)))
%Y Cf. A260731, A278516, A278517, A278519, A278521, A278522.
%K nonn
%O 0,2
%A _Antti Karttunen_, Nov 28 2016