|
| |
|
|
A368838
|
|
a(n) = n! * (n+3)! * Sum_{k=0..n} 1/(k! * (k+3)!).
|
|
2
|
|
|
|
1, 5, 51, 919, 25733, 1029321, 55583335, 3890833451, 342393343689, 36978481118413, 4807202545393691, 740309191990628415, 133255654558313114701, 27717176148129127857809, 6596687923254732430158543, 1781105739278777756142806611, 541456144740748437867413209745
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
0,2
|
|
|
LINKS
|
|
|
|
FORMULA
|
a(n) = n*(n+3)*a(n-1) + 1.
|
|
|
PROG
|
(PARI) a(n) = n!*(n+3)!*sum(k=0, n, 1/(k!*(k+3)!));
|
|
|
CROSSREFS
|
|
|
|
KEYWORD
|
nonn,easy
|
|
|
AUTHOR
|
|
|
|
STATUS
|
approved
|
| |
|
|
