|
|
A165792
|
|
a(0)=1, a(n) = n*(a(n-1)+2).
|
|
3
|
|
|
1, 3, 10, 36, 152, 770, 4632, 32438, 259520, 2335698, 23357000, 256927022, 3083124288, 40080615770, 561128620808, 8416929312150, 134670868994432, 2289404772905378, 41209285912296840, 782976432333639998, 15659528646672800000, 328850101580128800042
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
0,2
|
|
LINKS
|
|
|
FORMULA
|
a(n) = n! + 2*floor(e*n!)-2, n>0. - Gary Detlefs, Jun 06 2010
|
|
MATHEMATICA
|
NestList[{#[[1]]+1, (#[[1]]+1)(#[[2]]+2)}&, {0, 1}, 20][[All, 2]] (* Harvey P. Dale, Jul 03 2021 *)
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|