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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 30 |
| 4 | 586 |
| 5 | 17865 |
| 6 | 756285 |
| 7 | 41440056 |
| 8 | 2805638310 |
| 9 | 227131872654 |
| 10 | 21459076173105 |
| 11 | 2322336372705030 |
| 12 | 283667666439112350 |
| 13 | 38643426990067599005 |
| 14 | 5813534115429573742587 |
| 15 | 957883907138024944675200 |
[1,1,3,30,586,17865,756285,41440056,2805638310, 227131872654,21459076173105,2322336372705030, 283667666439112350,38643426990067599005, 5813534115429573742587,957883907138024944675200] |