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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 30 |
| 4 | 244 |
| 5 | 2485 |
| 6 | 30351 |
| 7 | 432502 |
| 8 | 7043660 |
| 9 | 129050649 |
| 10 | 2627117875 |
| 11 | 58829021416 |
| 12 | 1437117395946 |
| 13 | 38032508860177 |
| 14 | 1083932872119839 |
| 15 | 33098858988564090 |
| 16 | 1078083456543449416 |
| 17 | 37309607437056658129 |
| 18 | 1367138649165397662627 |
| 19 | 52879280631976735387588 |
[1,1,5,30,244,2485,30351,432502,7043660,129050649, 2627117875,58829021416,1437117395946, 38032508860177,1083932872119839,33098858988564090, 1078083456543449416,37309607437056658129, 1367138649165397662627,52879280631976735387588] |