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Search: id:A000784
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| A000784 |
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Symmetrical planar partitions of n: planar partitions (A000219) that when regarded as 3-D objects have just one symmetry plane).
(Formerly M0322 N0119)
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+0
9
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| 0, 1, 2, 2, 4, 6, 6, 11, 16, 20, 28, 41, 51, 70, 93, 122, 158, 211, 266, 350, 450, 577, 730, 948, 1186, 1510, 1901, 2408, 2999, 3790, 4703, 5898, 7310, 9111, 11231, 13979, 17168, 21229, 26036, 32095, 39188, 48155, 58657, 71798, 87262, 106472, 129014
(list; graph; listen)
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OFFSET
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1,3
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REFERENCES
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P. A. MacMahon, Combinatory Analysis. Cambridge Univ. Press, London and New York, Vol. 1, 1915 and Vol. 2, 1916; see vol. 2, p 332.
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LINKS
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P. A. MacMahon, Combinatory analysis.
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CROSSREFS
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Equals -A048141+2*A048140-A000219. Cf. A000785, A000786, A005987, A048142.
Adjacent sequences: A000781 A000782 A000783 this_sequence A000785 A000786 A000787
Sequence in context: A008130 A055388 A065457 this_sequence A092991 A102425 A143216
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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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More terms from Wouter Meeussen (wouter.meeussen(AT)pandora.be).
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