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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 57775905 |
| 4 | 716068213864217155 |
| 5 | 276584170067890425950927140800 |
| 6 | 1842950731180774733190378188820331816058325 |
| 7 | 138888194169408560414765498059420203413991485926907191875 |
[0,1,57775905,716068213864217155, 276584170067890425950927140800, 1842950731180774733190378188820331816058325, 13888819416940856041476549805942020341399148592690\ 7191875] |