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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 8 |
| 3 | 648 |
| 4 | 663552 |
| 5 | 10368000000 |
| 6 | 2902376448000000 |
| 7 | 16731622649806848000000 |
| 8 | 2245680377810414777401344000000 |
| 9 | 7830203310981140781182893575634944000000 |
| 10 | 783020331098114078118289357563494400000000000000000 |
| 11 | 2457453226667794121573260254679367673480373862400000000000000000 |
[1,1,8,648,663552,10368000000,2902376448000000, 16731622649806848000000, 2245680377810414777401344000000, 7830203310981140781182893575634944000000, 78302033109811407811828935756349440000000000000000\ 0, 24574532266677941215732602546793676734803738624000\ 00000000000000] |