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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 39 |
| 4 | 580 |
| 5 | 11685 |
| 6 | 298566 |
| 7 | 9248701 |
| 8 | 336886936 |
| 9 | 14112113049 |
| 10 | 668422303210 |
| 11 | 35325208755441 |
| 12 | 2060811941835780 |
| 13 | 131547166492534117 |
| 14 | 9120279070776381886 |
| 15 | 682489450793082237285 |
| 16 | 54828316394224735284016 |
| 17 | 4706545644403274325580593 |
[1,1,4,39,580,11685,298566,9248701,336886936, 14112113049,668422303210,35325208755441, 2060811941835780,131547166492534117, 9120279070776381886,682489450793082237285, 54828316394224735284016,4706545644403274325580593] |