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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 10 |
| 2 | 180 |
| 3 | 47940 |
| 4 | 3185189700 |
| 5 | 13760582141553025860 |
| 6 | 254536428082497193743150874618461037380 |
| 7 | 86730091025558229301371439971941296450524845723997443510460490068605668041540 |
[2,10,180,47940,3185189700,13760582141553025860, 254536428082497193743150874618461037380, 86730091025558229301371439971941296450524845723997\ 443510460490068605668041540] |