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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 8 |
| 3 | 112 |
| 4 | 1972 |
| 5 | 39404 |
| 6 | 853892 |
| 7 | 19591692 |
| 8 | 469250416 |
| 9 | 11628163256 |
| 10 | 296351290004 |
| 11 | 7736140181364 |
| 12 | 206273152705660 |
| 13 | 5606990999026252 |
| 14 | 155184267041459384 |
| 15 | 4370129283473065984 |
| 16 | 125189806731347999476 |
| 17 | 3648813481714933367516 |
| 18 | 108265665575110494127284 |
| 19 | 3273367006162760350945260 |
| 20 | 100977120404026793376264880 |
| 21 | 3183255539561434435490787720 |
[1,1,8,112,1972,39404,853892,19591692,469250416, 11628163256,296351290004,7736140181364, 206273152705660,5606990999026252, 155184267041459384,4370129283473065984, 125189806731347999476,3648813481714933367516, 108265665575110494127284, 3273367006162760350945260, 100977120404026793376264880, 3183255539561434435490787720] |