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Search: id:A003993
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| A003993 |
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Sequence b_3 (n) arising from homology of partitions with even number of blocks. |
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+0
2
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| 2, 12, 46, 152, 474, 1444, 4358, 13104, 39346, 118076, 354270, 1062856, 3188618, 9565908, 28697782, 86093408, 258280290, 774840940, 2324522894, 6973568760, 20920706362, 62762119172, 188286357606
(list; graph; listen)
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OFFSET
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2,1
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REFERENCES
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S. Sundaram, The homology of partitions with an even number of blocks, J. Alg. Comb., 4 (1995), 69-92.
S. Sundaram, Plethysm, partitions with an even number of blocks and Euler numbers, DIMACS Series, Vol. 24 (1996), 171-198, Amer. Math. Soc.
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MAPLE
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A003993 := proc(n) option remember; if n = 1 then 2 else 3*A003993(n-1)+4*n-2; fi; end;
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CROSSREFS
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Cf. A003994.
Sequence in context: A046991 A061990 A006742 this_sequence A129018 A069946 A048501
Adjacent sequences: A003990 A003991 A003992 this_sequence A003994 A003995 A003996
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KEYWORD
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nonn
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AUTHOR
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Sheila Sundaram (sheila(AT)paris-gw.cs.miami.edu)
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