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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 19 |
| 4 | 120 |
| 5 | 741 |
| 6 | 5032 |
| 7 | 35253 |
| 8 | 255821 |
| 9 | 1898309 |
| 10 | 14350653 |
| 11 | 110094949 |
| 12 | 855048115 |
| 13 | 6709326541 |
| 14 | 53110380781 |
[1,5,19,120,741,5032,35253,255821,1898309, 14350653,110094949,855048115,6709326541, 53110380781] |