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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 13 |
| 3 | 76 |
| 4 | 538 |
| 5 | 4475 |
| 6 | 42690 |
| 7 | 460078 |
| 8 | 5529599 |
| 9 | 73363513 |
| 10 | 1065232928 |
| 11 | 16805164107 |
| 12 | 286272028319 |
| 13 | 5237527189339 |
| 14 | 102436515541828 |
| 15 | 2132945295370361 |
| 16 | 47110759618985100 |
| 17 | 1100186748111381882 |
| 18 | 27086589720802913597 |
| 19 | 701202975449809856301 |
[1,3,13,76,538,4475,42690,460078,5529599,73363513, 1065232928,16805164107,286272028319,5237527189339, 102436515541828,2132945295370361, 47110759618985100,1100186748111381882, 27086589720802913597,701202975449809856301] |