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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 26 |
| 4 | 314 |
| 5 | 5222 |
| 6 | 168632 |
| 7 | 5736908 |
| 8 | 291993032 |
| 9 | 18599068328 |
| 10 | 1547379999392 |
| 11 | 136254185631632 |
| 12 | 18749419634845088 |
| 13 | 2367416741670079712 |
| 14 | 387737484226037810048 |
| 15 | 78779133220155242489792 |
| 16 | 17651532033334188604514432 |
| 17 | 3945247307615376458903485568 |
[1,4,26,314,5222,168632,5736908,291993032, 18599068328,1547379999392,136254185631632, 18749419634845088,2367416741670079712, 387737484226037810048,78779133220155242489792, 17651532033334188604514432, 3945247307615376458903485568] |