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Search: id:A120421
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| A120421 |
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Number of distinct ribbon Schur functions with n boxes; also the number of distinct multisets of partitions determined by all coarsenings of compositions of n. |
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+0
1
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| 1, 2, 3, 6, 10, 20, 36, 72, 135, 272, 528, 1052, 2080, 4160, 8244, 16508, 32896, 65768
(list; graph; listen)
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OFFSET
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1,2
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REFERENCES
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Louis Billera, Hugh Thomas and Stephanie van Willigenburg "Decomposable compositions, symmetric quasisymmetric functions and equality of ribbon Schur functions" Adv. Math. 204: 204-240 (2006).
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LINKS
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Louis Billera, Hugh Thomas and Stephanie van Willigenburg "Decomposable compositions, symmetric quasisymmetric functions and equality of ribbon Schur functions" Adv. Math. 204: 204-240 (2006).
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EXAMPLE
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a(4)=6 as the multisets are {4}, {4,31}, {4,22}, {4,31,22,211}, {4,31,31,211} and {4,31,31,22,211,211,211,1111}
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CROSSREFS
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Cf. A005418.
Sequence in context: A008927 A052525 A006606 this_sequence A005418 A002215 A007562
Adjacent sequences: A120418 A120419 A120420 this_sequence A120422 A120423 A120424
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KEYWORD
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nonn
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AUTHOR
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Stephanie van Willigenburg (steph(AT)math.ubc.ca), Jul 09 2006
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