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A176724 Triangle for number of partitions which define multiset repetition classes. 4

%I #15 Aug 29 2019 17:19:28

%S 1,0,1,0,1,1,0,0,1,1,0,0,0,1,1,0,0,1,1,1,1,0,0,0,1,1,1,1,0,0,0,0,1,1,

%T 1,1,0,0,0,0,1,2,1,1,1,0,0,0,1,0,1,2,1,1,1,0,0,0,0,1,0,1,2,1,1,1,0,0,

%U 0,0,0,2,1,2,2,1,1,1,0,0,0,0,0,1,2,1,2,2,1,1,1,0,0,0,0,0,0,1,2,1,2,2,1,1,1

%N Triangle for number of partitions which define multiset repetition classes.

%C For definitions, references, links and examples see the corresponding partition array A176723.

%C Row sums coincide with those of array A176723 for n>=1, and they are given by A007294.

%C If for n=0 a 1 is added (the empty partition defines the empty multiset class) the tabl structure will be lost.

%H W. Lang: <a href="/A176724/a176724.txt">First 15 rows and row sums.</a>

%F a(n,m) is the number of m part partitions of n which define m-multiset repetition classes. Multiset repetition class defining is equivalent to the following constraint on the exponents of a partition (1^e[1],2^e[2],...,M^e[M]):

%F e[1] >= e[2]>=...>=e[M]>=1, i.e., positive nonincreasing with largest part M. This will satisfy T(M) <= n where T(M) = A000217(M) are the triangular numbers; for each n every sufficiently small positive M does occur.

%e 1;

%e 0,1;

%e 0,1,1;

%e 0,0,1,1;

%e 0,0,0,1,1;

%e 0,0,1,1,1,1;

%e 0,0,0,1,1,1,1;

%e ...

%Y a(7,5)=1 because there is only one 5 part partition of 7 which is 5-multiset repetition class defining, namely (1^3,2^2) (see row n=7 of the partition array A176723). This defines the 5-multiset class representative {1,1,1,2,2}.

%K nonn,easy,tabl

%O 1,42

%A _Wolfdieter Lang_, Jul 14 2010

%E Edited (in response to comments by _Franklin T. Adams-Watters_) by _Wolfdieter Lang_, Apr 02 2011

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Last modified August 18 05:18 EDT 2024. Contains 375255 sequences. (Running on oeis4.)