|
Search: id:A090319
|
|
| |
|
| 1, 4, 14, 52, 217, 1040, 5768, 36992, 272584, 2285184, 21550656, 226071744, 2611146384, 32911082496, 449243785728, 6598780563456, 103734755882496, 1737181702840320, 30866291090657280, 579859321408266240
(list; graph; listen)
|
|
|
OFFSET
|
0,2
|
|
|
COMMENT
|
columns, for k = 0, 1, 2, 3 : A000007, A000142, A003149, A090595.
|
|
FORMULA
|
a(n) = Sum_{k=0..n} A090595(k)*(n-k)! . a(n) = Sum_{a+b+c+d = n} a!*b!*c!*d! . a(n) = Sum_{k=0..n} A003149(k)*A003149(n-k) . G.f.: (Sum_{k>=0} k!*x^k )^4.
|
|
CROSSREFS
|
Cf. A084938.
Sequence in context: A129997 A149489 A125783 this_sequence A047118 A017948 A112872
Adjacent sequences: A090316 A090317 A090318 this_sequence A090320 A090321 A090322
|
|
KEYWORD
|
easy,nonn
|
|
AUTHOR
|
DELEHAM Philippe (kolotoko(AT)wanadoo.fr), Feb 05 2004
|
|
|
Search completed in 0.002 seconds
|
