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Search: id:A006477
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| A006477 |
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Number of partitions of n with at least 1 odd and 1 even part.
(Formerly M3232)
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+0
2
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| 0, 0, 0, 1, 1, 4, 4, 10, 11, 22, 25, 44, 51, 83, 98, 149, 177, 259, 309, 436, 521, 716, 857, 1151, 1376, 1816, 2170, 2818, 3361, 4309, 5132, 6502, 7728, 9695, 11501, 14298, 16924, 20877, 24661, 30203, 35598, 43323, 50956, 61651, 72357, 87086, 101999
(list; graph; listen)
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OFFSET
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0,6
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REFERENCES
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M. O. LeVan, A triangle for partitions, Amer. Math. Monthly, 79 (1972), 507-510.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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FORMULA
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Convolution of 0, 1, 1, 2, 2, 3, 4, 5, 6, ... (essentially A000009) and 0, 0, 1, 0, 2, 0, 3, 0, 5, ... (essentially A035363).
G.f.: (prod(1/(1-x^k), k odd)-1) * (prod(1/(1-x^k), k even)-1)
A000041(n)-A000009(n) if n is odd else A000041(n)-A000009(n)-A000041(n/2). - Vladeta Jovovic (vladeta(AT)eunet.rs), Sep 10 2003
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CROSSREFS
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Cf. A047967, A038348.
Sequence in context: A101256 A116569 A058187 this_sequence A058596 A050339 A087288
Adjacent sequences: A006474 A006475 A006476 this_sequence A006478 A006479 A006480
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
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More terms from David W. Wilson (davidwwilson(AT)comcast.net), May 11, 2001
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