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A329768 Number of finite sequences of positive integers whose sum minus runs-resistance is n. 1

%I #4 Nov 22 2019 16:13:34

%S 8,17,42,104,242,541,1212,2664,5731,12314

%N Number of finite sequences of positive integers whose sum minus runs-resistance is n.

%C A composition of n is a finite sequence of positive integers with sum n.

%C For the operation of taking the sequence of run-lengths of a finite sequence, runs-resistance is defined as the number of applications required to reach a singleton.

%H Claude Lenormand, <a href="/A318921/a318921.pdf">Deux transformations sur les mots</a>, Preprint, 5 pages, Nov 17 2003.

%e The a(1) = 8 and a(2) = 17 compositions whose sum minus runs-resistance is n:

%e (1) (2)

%e (1,1) (1,3)

%e (1,2) (3,1)

%e (2,1) (1,1,1)

%e (1,1,2) (1,1,3)

%e (2,1,1) (1,2,1)

%e (1,1,2,1) (1,2,2)

%e (1,2,1,1) (2,2,1)

%e (3,1,1)

%e (1,1,1,2)

%e (1,1,3,1)

%e (1,3,1,1)

%e (2,1,1,1)

%e (1,1,1,2,1)

%e (1,2,1,1,1)

%e (1,2,1,1,2)

%e (2,1,1,2,1)

%Y Column sums of A329750.

%Y Cf. A000740, A008965, A098504, A242882, A318928, A329744, A329745, A329746, A329747, A329767.

%K nonn,more

%O 1,1

%A _Gus Wiseman_, Nov 21 2019

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Last modified August 25 19:47 EDT 2024. Contains 375454 sequences. (Running on oeis4.)