The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A319752 Number of non-isomorphic intersecting multiset partitions of weight n. 29

%I #5 Sep 28 2018 15:21:34

%S 1,1,3,6,16,35,94,222,584,1488,3977

%N Number of non-isomorphic intersecting multiset partitions of weight n.

%C A multiset partition is intersecting if no two parts are disjoint. The weight of a multiset partition 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(4) = 16 multiset partitions:

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

%Y Cf. A319755, A319759, A319760, A319765, A319779, A319787, A319789.

%K nonn,more

%O 0,3

%A _Gus Wiseman_, Sep 27 2018

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 18 23:43 EDT 2024. Contains 372666 sequences. (Running on oeis4.)