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A225085 Triangle read by rows: T(n,k) is the number of compositions of n with maximal up-step <= k; n>=1, 0<=k<n. 3

%I #12 Feb 22 2014 13:06:02

%S 1,2,2,3,4,4,5,7,8,8,7,13,15,16,16,11,23,29,31,32,32,15,41,55,61,63,

%T 64,64,22,72,105,119,125,127,128,128,30,127,199,233,247,253,255,256,

%U 256,42,222,378,455,489,503,509,511,512,512,56,388,716,889,967,1001,1015,1021,1023,1024,1024

%N Triangle read by rows: T(n,k) is the number of compositions of n with maximal up-step <= k; n>=1, 0<=k<n.

%C T(n,k) is the number of compositions [p(1), p(2), ..., p(k)] of n such that max(p(j) - p(j-1)) <= k.

%C Rows are partial sums of rows of A225084.

%C The first column is A000041 (partition numbers), the second column is A003116, and the third column is A224959.

%C The diagonal is A011782.

%H Joerg Arndt and Alois P. Heinz, <a href="/A225085/b225085.txt">Rows n = 1..141, flattened</a>

%e Triangle begins

%e 01: 1,

%e 02: 2, 2,

%e 03: 3, 4, 4,

%e 04: 5, 7, 8, 8,

%e 05: 7, 13, 15, 16, 16,

%e 06: 11, 23, 29, 31, 32, 32,

%e 07: 15, 41, 55, 61, 63, 64, 64,

%e 08: 22, 72, 105, 119, 125, 127, 128, 128,

%e 09: 30, 127, 199, 233, 247, 253, 255, 256, 256,

%e 10: 42, 222, 378, 455, 489, 503, 509, 511, 512, 512,

%e ...

%e The fifth row corresponds to the following statistics:

%e #: M composition

%e 01: 0 [ 1 1 1 1 1 ]

%e 02: 1 [ 1 1 1 2 ]

%e 03: 1 [ 1 1 2 1 ]

%e 04: 2 [ 1 1 3 ]

%e 05: 1 [ 1 2 1 1 ]

%e 06: 1 [ 1 2 2 ]

%e 07: 2 [ 1 3 1 ]

%e 08: 3 [ 1 4 ]

%e 09: 0 [ 2 1 1 1 ]

%e 10: 1 [ 2 1 2 ]

%e 11: 0 [ 2 2 1 ]

%e 12: 1 [ 2 3 ]

%e 13: 0 [ 3 1 1 ]

%e 14: 0 [ 3 2 ]

%e 15: 0 [ 4 1 ]

%e 16: 0 [ 5 ]

%e There are 7 compositions with no up-step (M<=0), 13 with M<=1, 15 with M<=2, 16 with M<=3, and 16 with M<=4.

%K nonn,tabl

%O 1,2

%A _Joerg Arndt_, Apr 27 2013

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Last modified April 25 06:49 EDT 2024. Contains 371964 sequences. (Running on oeis4.)