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A319755 Number of non-isomorphic intersecting set multipartitions (multisets of sets) of weight n. 15

%I #5 Sep 28 2018 15:21:49

%S 1,1,2,3,6,9,19,30,60,107,212

%N Number of non-isomorphic intersecting set multipartitions (multisets of sets) of weight n.

%C A set multipartition is intersecting if no two parts are disjoint. The weight of a set multipartition is the sum of sizes of its parts. Weight is generally not the same as number of vertices.

%e Non-isomorphic representatives of the a(1) = 1 through a(5) = 9 set multipartitions:

%e 1: {{1}}

%e 2: {{1,2}}

%e {{1},{1}}

%e 3: {{1,2,3}}

%e {{2},{1,2}}

%e {{1},{1},{1}}

%e 4: {{1,2,3,4}}

%e {{3},{1,2,3}}

%e {{1,2},{1,2}}

%e {{1,3},{2,3}}

%e {{2},{2},{1,2}}

%e {{1},{1},{1},{1}}

%e 5: {{1,2,3,4,5}}

%e {{4},{1,2,3,4}}

%e {{1,4},{2,3,4}}

%e {{2,3},{1,2,3}}

%e {{2},{1,2},{1,2}}

%e {{3},{3},{1,2,3}}

%e {{3},{1,3},{2,3}}

%e {{2},{2},{2},{1,2}}

%e {{1},{1},{1},{1},{1}}

%Y Cf. A007716, A049311, A283877, A305854, A306006, A316980, A319616.

%Y Cf. A319748, A319752, A319759, A319760, A319765, A319779, A319787, A319789.

%K nonn,more

%O 0,3

%A _Gus Wiseman_, Sep 27 2018

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Last modified September 15 02:54 EDT 2024. Contains 375931 sequences. (Running on oeis4.)