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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 19 |
| 4 | 205 |
| 5 | 3276 |
| 6 | 70852 |
| 7 | 1953715 |
| 8 | 65904057 |
| 9 | 2639266228 |
| 10 | 122677374326 |
| 11 | 6503266277223 |
| 12 | 387708627582311 |
| 13 | 25700183133977665 |
| 14 | 1876381387159576676 |
| 15 | 149695388098709302361 |
| 16 | 12961535832843534300945 |
[1,1,3,19,205,3276,70852,1953715,65904057, 2639266228,122677374326,6503266277223, 387708627582311,25700183133977665, 1876381387159576676,149695388098709302361, 12961535832843534300945] |