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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 24 |
| 3 | 139 |
| 4 | 1595 |
| 5 | 17947 |
| 6 | 207116 |
| 7 | 2403703 |
| 8 | 27979008 |
| 9 | 325990496 |
| 10 | 3799972909 |
| 11 | 44303294071 |
| 12 | 516563566397 |
| 13 | 6023170715786 |
| 14 | 70231536050457 |
| 15 | 818919946988978 |
| 16 | 9548863433870338 |
| 17 | 111342842876041149 |
| 18 | 1298294120431505145 |
[1,24,139,1595,17947,207116,2403703,27979008, 325990496,3799972909,44303294071,516563566397, 6023170715786,70231536050457,818919946988978, 9548863433870338,111342842876041149, 1298294120431505145] |