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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 24 |
| 3 | 330 |
| 4 | 6354 |
| 5 | 157482 |
| 6 | 4772268 |
| 7 | 170950392 |
| 8 | 7066790676 |
| 9 | 331108863372 |
| 10 | 17340063707952 |
| 11 | 1003726452207960 |
| 12 | 63635982830437320 |
| 13 | 4385439331442232840 |
| 14 | 326404115258791793040 |
| 15 | 26093904013675118381760 |
| 16 | 2229931839713559043435920 |
[1,3,24,330,6354,157482,4772268,170950392, 7066790676,331108863372,17340063707952, 1003726452207960,63635982830437320, 4385439331442232840,326404115258791793040, 26093904013675118381760,2229931839713559043435920] |