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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 10 |
| 3 | 141 |
| 4 | 2584 |
| 5 | 58745 |
| 6 | 1602576 |
| 7 | 51165205 |
| 8 | 1874935168 |
| 9 | 77644293201 |
| 10 | 3588075308800 |
| 11 | 183111507687581 |
| 12 | 10230243235200000 |
| 13 | 621111794820235849 |
| 14 | 40722033570202507264 |
| 15 | 2867494972696071121125 |
| 16 | 215840579093024990396416 |
| 17 | 17294837586403146090259745 |
| 18 | 1469799445329208661211021312 |
[0,1,10,141,2584,58745,1602576,51165205, 1874935168,77644293201,3588075308800, 183111507687581,10230243235200000, 621111794820235849,40722033570202507264, 2867494972696071121125,215840579093024990396416, 17294837586403146090259745, 1469799445329208661211021312] |