|
Search: id:A037963
|
|
|
| A037963 |
|
(n+5)!*n^2*(3*n^3+10*n^2+5*n-2)/11520. |
|
+0
2
|
|
| 0, 1, 126, 5796, 186480, 5103000, 129230640, 3162075840, 76592355840, 1863435974400, 45950224320000, 1155068769254400, 29708792431718400, 783699448602470400, 21234672840116736000, 591499300737945600000
(list; graph; listen)
|
|
|
OFFSET
|
0,3
|
|
|
COMMENT
|
For n>=1, a(n) is equal to the number of surjections from {1,2,...,n+5} onto {1,2,...,n}. - Aleksandar M. Janjic and Milan R. Janjic (agnus(AT)blic.net), Feb 24 2007
|
|
REFERENCES
|
The right-hand side of a binomial coefficient identity in H. W. Gould, Combinatorial Identities, Morgantown, 1972.
|
|
LINKS
|
Milan Janjic, Enumerative Formulas for Some Functions on Finite Sets
|
|
CROSSREFS
|
Adjacent sequences: A037960 A037961 A037962 this_sequence A037964 A037965 A037966
Sequence in context: A086024 A036403 A140902 this_sequence A075919 A121004 A027491
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
njas
|
|
|
Search completed in 0.002 seconds
|
