|
| |
|
|
A091348
|
|
a(n)=24*5^n - 60*4^n + 50*3^n - 15*2^n + 1.
|
|
1
| |
|
|
0, 1, 31, 391, 3451, 25231, 164731, 999391, 5767051, 32122831, 174397531, 929043391, 4879252651, 25349936431, 130617150331, 668714319391, 3406562690251, 17286209766031, 87448932863131, 441329102667391
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 0,3
|
|
|
FORMULA
| a(n)=Sum(i!i^4 Stirling2(n, i)(-1)^(n-i), i=1, .., n)
|
|
|
MATHEMATICA
| Table[24*5^n - 60*4^n + 50*3^n - 15*2^n + 1, {n, 0, 25}]
|
|
|
CROSSREFS
| Sequence in context: A042868 A047689 A108268 * A179465 A142829 A022691
Adjacent sequences: A091345 A091346 A091347 * A091349 A091350 A091351
|
|
|
KEYWORD
| easy,nonn
|
|
|
AUTHOR
| Mario Catalani (mario.catalani(AT)unito.it), Jan 03 2004
|
| |
|
|
