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 A292444 Number of non-isomorphic finite multisets that cannot be expressed as the multiset-union of a set of sets. 9
 0, 1, 1, 2, 3, 5, 6, 9, 12, 17, 22 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 COMMENTS Non-isomorphic finite multisets correspond to integer partitions. For example, the partition (3221) corresponds to the multiset {1,1,1,2,2,3,3,4}. Problem: Is this sequence equal to A258939 or to A035948? LINKS EXAMPLE Representatives of the a(7) = 6 multisets are: {1,1,1,1,1,1,1}, {1,1,1,1,1,1,2}, {1,1,1,1,1,2,2}, {1,1,1,1,1,2,3}, {1,1,1,1,2,2,2}, {1,1,1,1,2,2,3}. CROSSREFS Cf. A049311, A089259, A116540, A283877, A292432. Sequence in context: A084993 A046966 A225973 * A035948 A258939 A244747 Adjacent sequences:  A292441 A292442 A292443 * A292445 A292446 A292447 KEYWORD nonn,more AUTHOR Gus Wiseman, Oct 02 2017 STATUS approved

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Last modified June 15 16:13 EDT 2019. Contains 324142 sequences. (Running on oeis4.)