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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 10 |
| 3 | 123 |
| 4 | 1984 |
| 5 | 38765 |
| 6 | 899856 |
| 7 | 24135055 |
| 8 | 734381824 |
| 9 | 24985937241 |
| 10 | 939674886400 |
| 11 | 38697245287811 |
| 12 | 1731506682516480 |
| 13 | 83631998873272837 |
| 14 | 4336190248653942784 |
| 15 | 240186479159794548375 |
| 16 | 14153996066789439471616 |
| 17 | 884109266328681103701425 |
| 18 | 58346867827408911965945856 |
[1,1,10,123,1984,38765,899856,24135055,734381824, 24985937241,939674886400,38697245287811, 1731506682516480,83631998873272837, 4336190248653942784,240186479159794548375, 14153996066789439471616,884109266328681103701425, 58346867827408911965945856] |