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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | 8 |
| 3 | 90 |
| 4 | 1493 |
| 5 | 40148 |
| 6 | 1536501 |
| 7 | 78716604 |
| 8 | 5275720734 |
| 9 | 445867194366 |
| 10 | 46449459576595 |
| 11 | 5844108759723625 |
| 12 | 873766735145244948 |
| 13 | 153087877536458860660 |
| 14 | 31062245895591356844637 |
| 15 | 7225340509057562100376047 |
| 16 | 1909774727511978452561271489 |
| 17 | 569166269815032401548622424344 |
[0,2,8,90,1493,40148,1536501,78716604,5275720734, 445867194366,46449459576595,5844108759723625, 873766735145244948,153087877536458860660, 31062245895591356844637,7225340509057562100376047, 1909774727511978452561271489, 569166269815032401548622424344] |