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Search: id:A066222
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| 1, 9, 75, 763, 9495, 140151, 2390479, 46206735, 997313823, 23758664095, 618884638911, 17492190577599, 532985208200575, 17411277367391103, 606917269909048575, 22481059424730751231, 881687990282453393919
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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a(n) is the number of sets of disjoint pairs that can be chosen from 2*n items. - Ron Zeno (rzeno(AT)hotmail.com), Feb 06 2002
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CROSSREFS
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Sequence in context: A095249 A136659 A126965 this_sequence A080254 A161736 A056339
Adjacent sequences: A066219 A066220 A066221 this_sequence A066223 A066224 A066225
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KEYWORD
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nonn,easy
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Dec 19 2001
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EXTENSIONS
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More terms from Frank Ellermann, Jan 01, 2002
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