|
|
A052699
|
|
Expansion of e.g.f. (1+x^5-x^6)/(1-x).
|
|
2
|
|
|
1, 1, 2, 6, 24, 240, 720, 5040, 40320, 362880, 3628800, 39916800, 479001600, 6227020800, 87178291200, 1307674368000, 20922789888000, 355687428096000, 6402373705728000, 121645100408832000, 2432902008176640000
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
0,3
|
|
LINKS
|
|
|
FORMULA
|
E.g.f.: (1+x^5-x^6)/(1-x).
a(n+1) = (n+1)*a(n), for n > 5.
a(n) = n! + 5!*[n=5].
|
|
MAPLE
|
spec := [S, {S=Union(Sequence(Z), Prod(Z, Z, Z, Z, Z))}, labeled]: seq(combstruct[count](spec, size=n), n=0..20);
|
|
MATHEMATICA
|
With[{nn=20}, CoefficientList[Series[(1+x^5-x^6)/(1-x), {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Feb 04 2014 *)
Table[n! + 5!*Boole[n==5], {n, 0, 40}] (* G. C. Greubel, May 31 2022 *)
|
|
PROG
|
(SageMath) [factorial(n) + factorial(5)*bool(n==5) for n in (0..30)] # G. C. Greubel, May 31 2022
|
|
CROSSREFS
|
|
|
KEYWORD
|
easy,nonn
|
|
AUTHOR
|
encyclopedia(AT)pommard.inria.fr, Jan 25 2000
|
|
STATUS
|
approved
|
|
|
|