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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 13 |
| 3 | 146 |
| 4 | 1610 |
| 5 | 17715 |
| 6 | 194871 |
| 7 | 2143588 |
| 8 | 23579476 |
| 9 | 259374245 |
| 10 | 2853116705 |
| 11 | 31384283766 |
| 12 | 345227121438 |
| 13 | 3797498335831 |
| 14 | 41772481694155 |
| 15 | 459497298635720 |
| 16 | 5054470284992936 |
| 17 | 55599173134922313 |
| 18 | 611590904484145461 |
| 19 | 6727499949325600090 |
[1,13,146,1610,17715,194871,2143588,23579476, 259374245,2853116705,31384283766,345227121438, 3797498335831,41772481694155,459497298635720, 5054470284992936,55599173134922313, 611590904484145461,6727499949325600090] |