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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 68 |
| 4 | 24050 |
| 5 | 2756394 |
| 6 | 272728160 |
| 7 | 25579990362 |
| 8 | 2350935391670 |
| 9 | 214207950466488 |
| 10 | 19447388042814192 |
| 11 | 1762844647027428630 |
| 12 | 159690564587289765758 |
| 13 | 14461754182475369666696 |
| 14 | 1309512672900097786756946 |
[0,0,68,24050,2756394,272728160,25579990362, 2350935391670,214207950466488,19447388042814192, 1762844647027428630,159690564587289765758, 14461754182475369666696,1309512672900097786756946] |