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A000662 as a simple table
| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 136 |
| 3 | 22377984 |
| 4 | 768614354122719232 |
| 5 | 354460798875983863749270670915141632 |
| 6 | 146267071761884981524915186989628577728537526896649216991428608 |
[2,136,22377984,768614354122719232, 354460798875983863749270670915141632, 14626707176188498152491518698962857772853752689664\ 9216991428608] |