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A321484 Number of non-isomorphic self-dual connected multiset partitions of weight n. 0
1, 1, 1, 2, 3, 6, 9, 20, 35, 78, 141 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

COMMENTS

The dual of a multiset partition has, for each vertex, one part consisting of the indices (or positions) of the parts containing that vertex, counted with multiplicity. For example, the dual of {{1,2},{2,2}} is {{1},{1,2,2}}.

The weight of a multiset partition is the sum of sizes of its parts. Weight is generally not the same as number of vertices.

LINKS

Table of n, a(n) for n=0..10.

EXAMPLE

Non-isomorphic representatives of the a(1) = 1 through a(6) = 9 multiset partitions:

  {{1}}  {{11}}  {{111}}    {{1111}}    {{11111}}      {{111111}}

                 {{2}{12}}  {{12}{12}}  {{11}{122}}    {{112}{122}}

                            {{2}{122}}  {{12}{122}}    {{12}{1222}}

                                        {{2}{1222}}    {{2}{12222}}

                                        {{2}{13}{23}}  {{22}{1122}}

                                        {{3}{3}{123}}  {{12}{13}{23}}

                                                       {{2}{13}{233}}

                                                       {{3}{23}{123}}

                                                       {{3}{3}{1233}}

CROSSREFS

Cf. A007718, A056156, A138178, A316983, A319565, A319616, A319647, A319719, A321194, A321585, A321680, A321681.

Sequence in context: A320169 A293606 A185376 * A191469 A091053 A095064

Adjacent sequences:  A321481 A321482 A321483 * A321485 A321486 A321487

KEYWORD

nonn,more

AUTHOR

Gus Wiseman, Nov 16 2018

STATUS

approved

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Last modified May 29 02:24 EDT 2020. Contains 334694 sequences. (Running on oeis4.)