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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 1 |
| 3 | 33 |
| 4 | 791 |
| 5 | 17100 |
| 6 | 358024 |
| 7 | 7491484 |
| 8 | 159168428 |
| 9 | 3463513704 |
| 10 | 77559615576 |
| 11 | 1792139785920 |
| 12 | 42789106278720 |
| 13 | 1056302350122240 |
| 14 | 26964471256888320 |
| 15 | 711643650545422080 |
| 16 | 19410244660543737600 |
| 17 | 546854985563699289600 |
[0,0,1,33,791,17100,358024,7491484,159168428, 3463513704,77559615576,1792139785920, 42789106278720,1056302350122240,26964471256888320, 711643650545422080,19410244660543737600, 546854985563699289600] |