|
| |
|
|
A372994
|
|
a(n) = n! a(n-1) / a(n-2), where a(0) = 1, a(1) = 2.
|
|
1
|
|
|
|
1, 2, 4, 12, 72, 720, 7200, 50400, 282240, 2032128, 26127360, 513216000, 9408960000, 114162048000, 1057763266560, 12116197416960, 239661047808000, 7035575500800000, 187950374092800000, 3249661968064512000, 42064875721374105600, 661340826849411072000
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
0,2
|
|
|
LINKS
|
|
|
|
MATHEMATICA
|
a[0] = 1; a[1] = 2;
a[n_] := a[n] = n! a[n - 1]/a[n - 2];
Table[a[n], {n, 0, 22}]
|
|
|
CROSSREFS
|
|
|
|
KEYWORD
|
nonn
|
|
|
AUTHOR
|
|
|
|
STATUS
|
approved
|
| |
|
|
