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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 7 |
| 3 | 55 |
| 4 | 595 |
| 5 | 7351 |
| 6 | 110587 |
| 7 | 1884415 |
| 8 | 36154195 |
| 9 | 771983911 |
| 10 | 18141124267 |
| 11 | 463345240975 |
| 12 | 12792709110595 |
| 13 | 379854657215671 |
| 14 | 12057296962232347 |
| 15 | 407072488594360735 |
| 16 | 14565548824196479795 |
| 17 | 550582832110097346631 |
| 18 | 21917855760706255154827 |
| 19 | 916261422041320023467695 |
[1,1,7,55,595,7351,110587,1884415,36154195, 771983911,18141124267,463345240975,12792709110595, 379854657215671,12057296962232347, 407072488594360735,14565548824196479795, 550582832110097346631,21917855760706255154827, 916261422041320023467695] |