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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 16 |
| 3 | 190 |
| 4 | 2768 |
| 5 | 45584 |
| 6 | 814728 |
| 7 | 15439974 |
| 8 | 305760400 |
| 9 | 6265985440 |
| 10 | 131980086368 |
| 11 | 2843029539376 |
| 12 | 62400628835608 |
| 13 | 1391503990134080 |
| 14 | 31454839290752912 |
| 15 | 719470742267557110 |
| 16 | 16627360903974831120 |
| 17 | 387786053931422003360 |
[1,2,16,190,2768,45584,814728,15439974,305760400, 6265985440,131980086368,2843029539376, 62400628835608,1391503990134080,31454839290752912, 719470742267557110,16627360903974831120, 387786053931422003360] |