|
Search: id:A066387
|
|
|
| A066387 |
|
Triangle T(n,m) (1<=m<=n) giving number of maps f:N -> N such that f^m(X)=X+n for all natural numbers X. |
|
+0
1
|
|
| 1, 1, 2, 1, 0, 6, 1, 12, 0, 24, 1, 0, 0, 0, 120, 1, 120, 360, 0, 0, 720, 1, 0, 0, 0, 0, 0, 5040, 1, 1680, 0, 20160, 0, 0, 0, 40320, 1, 0, 60480, 0, 0, 0, 0, 0, 362880, 1, 30240, 0, 0, 1814400, 0, 0, 0, 0, 3628800, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 39916800
(list; table; graph; listen)
|
|
|
OFFSET
|
1,3
|
|
|
REFERENCES
|
A. Heinis, R. Jeurissen and L. Kamstra, Problem 18 and solution, Nieuw Arch. Wisk. 5/2 (2001) 380.
|
|
FORMULA
|
T(n, m) = n!/(n/m)! if m|n, T(n, m) = 0 otherwise.
|
|
CROSSREFS
|
Sequence in context: A119275 A129462 A122930 this_sequence A011312 A147720 A127631
Adjacent sequences: A066384 A066385 A066386 this_sequence A066388 A066389 A066390
|
|
KEYWORD
|
easy,nonn,tabl,nice
|
|
AUTHOR
|
Floor van Lamoen (fvlamoen(AT)hotmail.com), Dec 23 2001
|
|
|
Search completed in 0.002 seconds
|
