login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
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

Table of n, a(n) for n=1..11.

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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

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