|
| |
|
|
A035021
|
|
One seventh of 9-factorial numbers.
|
|
1
| |
|
|
1, 16, 400, 13600, 584800, 30409600, 1854985600, 129848992000, 10258070368000, 902710192384000, 87562888661248000, 9281666198092288000, 1067391612780613120000, 132356559984796026880000
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,2
|
|
|
LINKS
| Index entries for sequences related to factorial numbers
|
|
|
FORMULA
| 7*a(n) = (9*n-2)(!^9) := product(9*j-2, j=1..n); E.g.f. (-1+(1-9*x)^(-7/9))/7.
|
|
|
MATHEMATICA
| s=1; lst={s}; Do[s+=n*s; AppendTo[lst, s], {n, 15, 2*5!, 9}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Nov 08 2008]
|
|
|
CROSSREFS
| Cf. A007559, A034171, A045756, A035012, A035013, A035017, A035018, A035020-A035023.
Sequence in context: A051360 A071133 A186854 * A202733 A172205 A035275
Adjacent sequences: A035018 A035019 A035020 * A035022 A035023 A035024
|
|
|
KEYWORD
| easy,nonn
|
|
|
AUTHOR
| Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de)
|
| |
|
|
