|
Search: id:A014479
|
|
|
| A014479 |
|
Exponential generating function = (1+2x)/(1-2x)^3. |
|
+0
2
|
|
| 1, 8, 72, 768, 9600, 138240, 2257920, 41287680, 836075520, 18579456000, 449622835200, 11771943321600, 331576403558400, 9998303861145600, 321374052679680000, 10969567664799744000, 396275631890890752000
(list; graph; listen)
|
|
|
OFFSET
|
0,2
|
|
|
FORMULA
|
a(n) = A014477(n) * n!. - Franklin T. Adams-Watters (FrankTAW(AT)Netscape.net), Nov 02 2006
|
|
MAPLE
|
seq(add(count(Composition(k))*count(Permutation(k)), k=1..n), n=1..17); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Oct 17 2006
|
|
CROSSREFS
|
Sequence in context: A165323 A082366 A049388 this_sequence A013992 A129103 A111812
Adjacent sequences: A014476 A014477 A014478 this_sequence A014480 A014481 A014482
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
N. J. A. Sloane (njas(AT)research.att.com).
|
|
|
Search completed in 0.002 seconds
|
