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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 44 |
| 4 | 628 |
| 5 | 12994 |
| 6 | 363548 |
| 7 | 13141974 |
| 8 | 593579712 |
| 9 | 32644440048 |
| 10 | 2141946861312 |
| 11 | 164937634714896 |
| 12 | 14703536203936512 |
| 13 | 1500149281670010048 |
| 14 | 173464224256287048576 |
| 15 | 22541427301008492798144 |
| 16 | 3267767649638304967827456 |
| 17 | 525055667919614566758512640 |
[1,1,5,44,628,12994,363548,13141974,593579712, 32644440048,2141946861312,164937634714896, 14703536203936512,1500149281670010048, 173464224256287048576,22541427301008492798144, 3267767649638304967827456, 525055667919614566758512640] |