|
Search: id:A120380
|
|
|
| A120380 |
|
Number of partitions of n*(n+1). |
|
+0 1
|
|
| 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)
|
|
|
OFFSET
|
0,2
|
|
|
LINKS
|
Author?, Title
Author?, Title
|
|
EXAMPLE
|
a(2)=11 because the number of partitions of 6 is 11.
|
|
MAPLE
|
with(combinat); [seq(numbpart(n*(n+1)), n=1..20)];
with(combinat): seq(numbpart(n*(n+1)), n=0..21);
|
|
PROGRAM
|
(PARI) a(n)=numbpart(n^2+n) /* Michael Somos Jul 24 2006 */
|
|
CROSSREFS
|
Cf. A003107, A002378.
Adjacent sequences: A120377 A120378 A120379 this_sequence A120381 A120382 A120383
Sequence in context: A053481 A110329 A006766 this_sequence A079266 A094569 A099661
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 29 2006
|
|
EXTENSIONS
|
Edited by Michael Somos, Emeric Deutsch (deutsch(AT)duke.poly.edu) and njas, Jul 23 2006
|
|
|
Search completed in 0.002 seconds
|