|
| |
|
|
A034829
|
|
One half of sept-factorial numbers.
|
|
9
| |
|
|
1, 9, 144, 3312, 99360, 3676320, 161758080, 8249662080, 478480400640, 31101226041600, 2239288274995200, 176903773724620800, 15213724540317388800, 1414876382249517158400, 141487638224951715840000
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,2
|
|
|
LINKS
| Index entries for sequences related to factorial numbers
|
|
|
FORMULA
| 2*a(n) = (7*n-5)(!^7) := product(7*j-5, j=1..n); E.g.f. (-1+(1-7*x)^(-2/7))/2.
|
|
|
MATHEMATICA
| s=1; lst={s}; Do[s+=n*s; AppendTo[lst, s], {n, 8, 5!, 7}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Nov 08 2008]
|
|
|
CROSSREFS
| Cf. A045754, A034830, A034831, A034832, A034833, A034834.
Sequence in context: A134176 A067415 A069134 * A162993 A094594 A173213
Adjacent sequences: A034826 A034827 A034828 * A034830 A034831 A034832
|
|
|
KEYWORD
| easy,nonn
|
|
|
AUTHOR
| Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de)
|
| |
|
|
