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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 13 |
| 4 | 679 |
| 5 | 87781 |
| 6 | 35830153 |
| 7 | 43041488701 |
| 8 | 155818927585201 |
| 9 | 1688540173184520937 |
| 10 | 54881098051544185333873 |
| 11 | 5347007129460018897210926833 |
[0,1,13,679,87781,35830153,43041488701, 155818927585201,1688540173184520937, 54881098051544185333873, 5347007129460018897210926833] |