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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 7 |
| 3 | 119 |
| 4 | 3186 |
| 5 | 117204 |
| 6 | 5493672 |
| 7 | 313159146 |
| 8 | 21032534856 |
| 9 | 1626654909168 |
| 10 | 142381874412000 |
| 11 | 13915051276560048 |
| 12 | 1501957674420194736 |
| 13 | 177456652252068578544 |
| 14 | 22779601954164759020184 |
| 15 | 3156967397734735846493880 |
| 16 | 469790199951668305705905408 |
[0,1,7,119,3186,117204,5493672,313159146, 21032534856,1626654909168,142381874412000, 13915051276560048,1501957674420194736, 177456652252068578544,22779601954164759020184, 3156967397734735846493880, 469790199951668305705905408] |