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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 9 |
| 5 | 110 |
| 6 | 2741 |
| 7 | 140984 |
| 8 | 14177631 |
| 9 | 2659528044 |
| 10 | 893354807473 |
| 11 | 518557715842286 |
| 12 | 504147721518034695 |
| 13 | 798582385374168781307 |
| 14 | 2011030171464903368562576 |
| 15 | 7875983238415961664043803109 |
| 16 | 47030087514170790354083969835412 |
| 17 | 420571558854512807058857478503109736 |
[1,1,1,2,9,110,2741,140984,14177631,2659528044, 893354807473,518557715842286,504147721518034695, 798582385374168781307,2011030171464903368562576, 7875983238415961664043803109, 47030087514170790354083969835412, 420571558854512807058857478503109736] |