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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 37 |
| 3 | 596 |
| 4 | 11513 |
| 5 | 245356 |
| 6 | 5597060 |
| 7 | 133950215 |
| 8 | 3323281496 |
| 9 | 84787933926 |
| 10 | 2212123329500 |
| 11 | 58779046239904 |
| 12 | 1585796125188065 |
| 13 | 43337540217740908 |
| 14 | 1197492197496481744 |
| 15 | 33406620056723507124 |
| 16 | 939775084670916268134 |
| 17 | 26632926871927867655261 |
| 18 | 759732892913483065912296 |
[1,3,37,596,11513,245356,5597060,133950215, 3323281496,84787933926,2212123329500, 58779046239904,1585796125188065,43337540217740908, 1197492197496481744,33406620056723507124, 939775084670916268134,26632926871927867655261, 759732892913483065912296] |