|
| |
|
|
A351780
|
|
a(n) = n! * Sum_{k=0..n} (-k)^(n-k) * (n-k)^k/k!.
|
|
3
|
|
|
|
1, 0, -2, 6, 108, -2420, 8730, 1313718, -57930152, 567983736, 109544982390, -9917916180590, 321821829728388, 32383946348733252, -6591798188344856942, 531702135210365508270, 11136706526396459006640
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
0,3
|
|
|
LINKS
|
|
|
|
PROG
|
(PARI) a(n) = n!*sum(k=0, n, (-k)^(n-k)*(n-k)^k/k!);
|
|
|
CROSSREFS
|
|
|
|
KEYWORD
|
sign
|
|
|
AUTHOR
|
|
|
|
STATUS
|
approved
|
| |
|
|
