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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 1 |
| 3 | 5 |
| 4 | 46 |
| 5 | 534 |
| 6 | 7596 |
| 7 | 127756 |
| 8 | 2479856 |
| 9 | 54560512 |
| 10 | 1341716960 |
| 11 | 36468949824 |
| 12 | 1085680795200 |
| 13 | 35131589529152 |
| 14 | 1227777836217856 |
| 15 | 46086892351150592 |
| 16 | 1849266301464495616 |
| 17 | 78990342571085637120 |
| 18 | 3578513340735623076864 |
[0,0,1,5,46,534,7596,127756,2479856,54560512, 1341716960,36468949824,1085680795200, 35131589529152,1227777836217856,46086892351150592, 1849266301464495616,78990342571085637120, 3578513340735623076864] |