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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 37 |
| 5 | 162 |
| 6 | 3068518062211324 |
| 7 | 1079268324684171943515797470873767312825026176345571319042096689270 |
[0,1,2,37,162,3068518062211324, 10792683246841719435157974708737673128250261763455\ 71319042096689270] |