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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 121 |
| 3 | 244 |
| 4 | 14761 |
| 5 | 29766 |
| 6 | 1800721 |
| 7 | 3631208 |
| 8 | 219673201 |
| 9 | 442977610 |
| 10 | 26798329801 |
| 11 | 54039637212 |
| 12 | 3269176562521 |
| 13 | 6592392762254 |
| 14 | 398812742297761 |
| 15 | 804217877357776 |
| 16 | 48651885383764321 |
| 17 | 98107988644886418 |
| 18 | 5935131204076949401 |
| 19 | 11968370396798785220 |
[1,2,121,244,14761,29766,1800721,3631208, 219673201,442977610,26798329801,54039637212, 3269176562521,6592392762254,398812742297761, 804217877357776,48651885383764321, 98107988644886418,5935131204076949401, 11968370396798785220] |