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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 8 |
| 3 | 86 |
| 4 | 1075 |
| 5 | 14667 |
| 6 | 211799 |
| 7 | 3182454 |
| 8 | 49243854 |
| 9 | 779379652 |
| 10 | 12558073022 |
| 11 | 205312307834 |
| 12 | 3397359326116 |
| 13 | 56790504859929 |
| 14 | 957574385205771 |
| 15 | 16267419813629731 |
| 16 | 278162968238908681 |
| 17 | 4783813617177604232 |
| 18 | 82691541747420586716 |
| 19 | 1435895455224032519430 |
| 20 | 25035634270828781060188 |
[1,1,8,86,1075,14667,211799,3182454,49243854, 779379652,12558073022,205312307834,3397359326116, 56790504859929,957574385205771,16267419813629731, 278162968238908681,4783813617177604232, 82691541747420586716,1435895455224032519430, 25035634270828781060188] |