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Search: id:A007045
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| A007045 |
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Second diagonal of partition triangle A047812.
(Formerly M3896)
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+0
1
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| 0, 1, 5, 20, 51, 112, 221, 411, 720, 1221, 2003, 3206, 5021, 7728, 11698, 17472, 25766, 37580, 54254, 77617, 110087, 154942, 216488, 300456, 414365, 568113, 774571
(list; graph; listen)
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OFFSET
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2,3
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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).
R. K. Guy, Parker's permutation problem involves the Catalan numbers, Amer. Math. Monthly 100 (1993), 287-289.
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CROSSREFS
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Sequence in context: A062158 A034133 A006504 this_sequence A102227 A006010 A055383
Adjacent sequences: A007042 A007043 A007044 this_sequence A007046 A007047 A007048
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KEYWORD
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nonn,easy,nice
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), R. K. Guy
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