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Search: id:A006333
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| A006333 |
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From the enumeration of corners.
(Formerly M2175)
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+0
1
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| 0, 2, 60, 660, 4290, 20020, 74256, 232560, 639540, 1586310, 3617900, 7696260, 15438150, 29451240, 53796160, 94607040, 160908264, 265670730, 427156860, 670609940, 1030350090, 1552346268, 2297341200, 3344614000, 4796473500
(list; graph; listen)
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OFFSET
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0,2
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REFERENCES
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G. Kreweras, Sur une classe de problemes de denombrement lies au treillis des partitions des entiers, Cahiers du Bureau Universitaire de Recherche Op\'{e}rationnelle}, Institut de Statistique, Universit\'{e} de Paris, 6 (1965), circa p. 82.
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FORMULA
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a(n) = (n*(1 + n)^2*(2 + n)^2*(3 + n)*(1 + 2*n)*(3 + 2*n)*(5 + 2*n))/7560.
G.f.: 2*(1+20*x+75*x^2+75*x^3+20*x^4+x^5)/(1-x)^10.
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CROSSREFS
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A row of A132339.
Adjacent sequences: A006330 A006331 A006332 this_sequence A006334 A006335 A006336
Sequence in context: A048541 A067739 A059934 this_sequence A001760 A056923 A082787
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KEYWORD
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nonn
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AUTHOR
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njas
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