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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 19 |
| 4 | 648 |
| 5 | 35034 |
| 6 | 2670208 |
| 7 | 272185631 |
| 8 | 35771059816 |
| 9 | 5898174461866 |
| 10 | 1193978013414012 |
| 11 | 291425454605906442 |
| 12 | 84460020885960997128 |
| 13 | 28684514514013845794992 |
| 14 | 11286674783772300965795444 |
| 15 | 5094396145960067896123076579 |
| 16 | 2614825930760477198096727703504 |
| 17 | 1514515134552667357882578305228354 |
[1,1,2,19,648,35034,2670208,272185631,35771059816, 5898174461866,1193978013414012,291425454605906442, 84460020885960997128,28684514514013845794992, 11286674783772300965795444, 5094396145960067896123076579, 2614825930760477198096727703504, 1514515134552667357882578305228354] |