OFFSET
0,5
COMMENTS
A002956 can be thought of as a modular arithmetic version of the partition numbers (A000041). The number of "modulo n" partitions of n is the number of multisets of integers ranging from 1 to n, such that the sum of members of the multiset is congruent to 0 mod n, and no submultiset exists whose members sum to 0 mod n. Therefore, a(n) is the number of "modulo n" partitions which are not ordinary partitions of n.
LINKS
Finklea, Moore, Ponomarenko and Turner, Invariant Polynomials and Minimal Zero Sequences
EXAMPLE
CROSSREFS
KEYWORD
nonn
AUTHOR
Andrew Weimholt, Feb 01 2011
STATUS
approved