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A007045
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Second diagonal of partition triangle A047812.
(Formerly M3896)
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0
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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; refs; listen; history; internal format)
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OFFSET
| 2,3
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REFERENCES
| R. K. Guy, Parker's permutation problem involves the Catalan numbers, Amer. Math. Monthly 100 (1993), 287-289.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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CROSSREFS
| Sequence in context: A062158 A034133 A006504 * A102227 A173034 A006010
Adjacent sequences: A007042 A007043 A007044 * A007046 A007047 A007048
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KEYWORD
| nonn,easy,nice
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), R. K. Guy
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