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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 31 |
| 3 | 10254 |
| 4 | 12238276 |
| 5 | 41596930860 |
| 6 | 309346186680924 |
| 7 | 4522151204857137264 |
| 8 | 116038936382978521700928 |
| 9 | 4918677318766771695942334272 |
| 10 | 323424014903141386787887115413440 |
| 11 | 31725978444319999354629697685162941056 |
| 12 | 4460612938377274751881312432310360618154240 |
[1,1,31,10254,12238276,41596930860, 309346186680924,4522151204857137264, 116038936382978521700928, 4918677318766771695942334272, 323424014903141386787887115413440, 31725978444319999354629697685162941056, 4460612938377274751881312432310360618154240] |