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Search: id:A002219
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| A002219 |
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Number of cycle types of sums of two degree-n permutations,
(Formerly M2574 N1018)
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+0
2
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| 1, 3, 6, 14, 25, 53, 89, 167, 278, 480, 760, 1273, 1948, 3089, 4682, 7177, 10565, 15869, 22911, 33601, 47942, 68756, 96570, 136883, 189674, 264297, 362995, 499617, 678245, 924522, 1243098, 1676339, 2237625, 2988351, 3957525, 5247500
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Also biquanimous partitions of 2n. (A biquanimous partition is one that can be bisected into two equal sized parts: e.g. 3+2+1 is a biquanimous partition of 6 as it contains 3 and 2+1, but 5+1 is not.)
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REFERENCES
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N. Metropolis and P. R. Stein, An elementary solution to a problem in restricted partitions, J. Combin. Theory, 9 (1970), 365-376.
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CROSSREFS
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Cf. A064914.
Sequence in context: A056596 A026341 A026271 this_sequence A006906 A120940 A049940
Adjacent sequences: A002216 A002217 A002218 this_sequence A002220 A002221 A002222
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KEYWORD
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nonn,nice
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AUTHOR
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njas
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EXTENSIONS
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Better description from Vladeta Jovovic (vladeta(AT)Eunet.yu), Mar 06 2000
More terms and additional comments from Christian G. Bower (bowerc(AT)usa.net), Oct 12 2001
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