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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 8 |
| 2 | 42 |
| 3 | 1192 |
| 4 | 63954 |
| 5 | 5076392 |
| 6 | 615675322 |
| 7 | 104080146632 |
| 8 | 23400806440098 |
| 9 | 6758267272643528 |
| 10 | 2438041675354644298 |
| 11 | 1074467739302301394024 |
| 12 | 568047079307626755260018 |
| 13 | 354831538774222730953869416 |
[2,8,42,1192,63954,5076392,615675322,104080146632, 23400806440098,6758267272643528, 2438041675354644298,1074467739302301394024, 568047079307626755260018, 354831538774222730953869416] |