The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 192032 |
| 4 | 9969920 |
| 5 | 455700320 |
| 6 | 6065958144 |
| 7 | 84525491552 |
| 8 | 612465608192 |
| 9 | 4331653335264 |
| 10 | 21603867355136 |
| 11 | 105105371180480 |
| 12 | 393780775562496 |
| 13 | 1491357451752960 |
| 14 | 4669936000634112 |
| 15 | 14450643013388864 |
[0,0,192032,9969920,455700320,6065958144, 84525491552,612465608192,4331653335264, 21603867355136,105105371180480,393780775562496, 1491357451752960,4669936000634112, 14450643013388864] |