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Search: id:A120380
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| A120380 |
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Number of partitions of n*(n+1). |
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+0
1
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| 1, 2, 11, 77, 627, 5604, 53174, 526823, 5392783, 56634173, 607163746, 6620830889, 73232243759, 819876908323, 9275102575355, 105882246722733, 1218374349844333, 14118662665280005, 164637479165761044, 1930656072350465812, 22755290216580025259, 269435605212954994471
(list; graph; listen)
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OFFSET
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0,2
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LINKS
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Author?, Title
Author?, Title
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EXAMPLE
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a(2)=11 because the number of partitions of 6 is 11.
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MAPLE
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with(combinat); [seq(numbpart(n*(n+1)), n=1..20)];
with(combinat): seq(numbpart(n*(n+1)), n=0..21);
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PROGRAM
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(PARI) a(n)=numbpart(n^2+n) /* Michael Somos Jul 24 2006 */
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CROSSREFS
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Cf. A003107, A002378.
Sequence in context: A053481 A110329 A006766 this_sequence A079266 A094569 A151418
Adjacent sequences: A120377 A120378 A120379 this_sequence A120381 A120382 A120383
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KEYWORD
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nonn
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AUTHOR
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Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 29 2006
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EXTENSIONS
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Edited by Michael Somos, Emeric Deutsch (deutsch(AT)duke.poly.edu) and N. J. A. Sloane (njas(AT)research.att.com), Jul 23 2006
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