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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 14 |
| 4 | 27 |
| 5 | 194 |
| 6 | 1280 |
| 7 | 4087 |
| 8 | 17899 |
| 9 | 177410 |
| 10 | 4475004 |
| 11 | 13675793 |
| 12 | 89331132 |
| 13 | 572094041 |
| 14 | 9179761149 |
| 15 | 460095124907 |
| 16 | 1595216638427 |
| 17 | 11226446302402 |
| 18 | 77096607671300 |
| 19 | 713665720065805 |
| 20 | 15031530220319728 |
[1,1,3,14,27,194,1280,4087,17899,177410,4475004, 13675793,89331132,572094041,9179761149, 460095124907,1595216638427,11226446302402, 77096607671300,713665720065805,15031530220319728] |