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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 14 |
| 3 | 192 |
| 4 | 2996 |
| 5 | 53955 |
| 6 | 1110786 |
| 7 | 25808160 |
| 8 | 668740808 |
| 9 | 19129643325 |
| 10 | 598902606310 |
| 11 | 20371538593296 |
| 12 | 748148581865532 |
| 13 | 29505258575474591 |
| 14 | 1243695052515891626 |
| 15 | 55800352470853933440 |
| 16 | 2655106829377875895056 |
| 17 | 133547801741230053460761 |
[0,1,14,192,2996,53955,1110786,25808160,668740808, 19129643325,598902606310,20371538593296, 748148581865532,29505258575474591, 1243695052515891626,55800352470853933440, 2655106829377875895056,133547801741230053460761] |