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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 23 |
| 4 | 47 |
| 5 | 379 |
| 6 | 6149 |
| 7 | 16981 |
| 8 | 93127 |
| 9 | 1007987 |
| 10 | 34683269 |
| 11 | 104143225 |
| 12 | 684506305 |
| 13 | 4481690797 |
| 14 | 73052215235 |
| 15 | 4537008191795 |
| 16 | 15552690624695 |
| 17 | 110042979640819 |
| 18 | 751697531996549 |
| 19 | 7064674535403145 |
| 20 | 149891090186986537 |
| 21 | 15977133591670367177 |
| 22 | 61330039793632561775 |
[1,1,3,23,47,379,6149,16981,93127,1007987, 34683269,104143225,684506305,4481690797, 73052215235,4537008191795,15552690624695, 110042979640819,751697531996549,7064674535403145, 149891090186986537,15977133591670367177, 61330039793632561775] |