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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 257 |
| 3 | 7330 |
| 4 | 289925 |
| 5 | 18565676 |
| 6 | 1042651237 |
| 7 | 69221777920 |
| 8 | 5270005429705 |
| 9 | 415374654294352 |
| 10 | 35626036180630121 |
| 11 | 3293064510986584544 |
| 12 | 320276195119275204493 |
| 13 | 32969303384902657225792 |
| 14 | 3579970600334581051222093 |
| 15 | 406942001917387287570455296 |
[1,1,257,7330,289925,18565676,1042651237, 69221777920,5270005429705,415374654294352, 35626036180630121,3293064510986584544, 320276195119275204493,32969303384902657225792, 3579970600334581051222093, 406942001917387287570455296] |