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Search: id:A089924
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| A089924 |
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Number of plane partitions of n with 3 or more columns. |
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+0
5
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| 0, 0, 1, 3, 8, 19, 41, 85, 167, 319, 588, 1066, 1880, 3272, 5588, 9431, 15686, 25841, 42070, 67926
(list; graph; listen)
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OFFSET
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1,4
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COMMENT
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Because of symmetry of the 3-dimensional-Ferrers plots, this sequence also counts the plane partitions with 3 or more rows, and the plane partitions with maximal element >= 3
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LINKS
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PlanePartitions
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EXAMPLE
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a(4)=3:
1111 111 211
.... 1.. ...
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MATHEMATICA
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(*planepartitions[] : see link *); Table[Count[planepartitions[n], q_ /; Length[First[q]] >= 3], {n, 12}]
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CROSSREFS
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Cf. A000219.
Adjacent sequences: A089921 A089922 A089923 this_sequence A089925 A089926 A089927
Sequence in context: A136396 A006380 A095846 this_sequence A072916 A074839 A002318
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KEYWORD
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nonn
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AUTHOR
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Wouter Meeussen (wouter.meeussen(AT)pandora.be), Jan 11 2004
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