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Search: id:A006200
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| A006200 |
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Number of partitions into pairs.
(Formerly M4263)
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+0
2
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| 1, 6, 55, 610, 7980, 120274, 2052309, 39110490, 823324755, 18974858540, 475182478056, 12848667150956, 373081590628565, 11578264139795430, 382452947343624515
(list; graph; listen)
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OFFSET
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1,2
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
G. Kreweras and Y. Poupard, Sur les partitions en paires d'un ensemble fini totalement ordonne, Publications de l'Institut de Statistique de l'Universit\'{e} de Paris, 23 (1978), 57-74.
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CROSSREFS
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Sequence in context: A110431 A118836 A079589 this_sequence A151345 A095652 A132689
Adjacent sequences: A006197 A006198 A006199 this_sequence A006201 A006202 A006203
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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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