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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 19 |
| 4 | 181 |
| 5 | 2341 |
| 6 | 38071 |
| 7 | 748567 |
| 8 | 17262505 |
| 9 | 457068745 |
| 10 | 13667029291 |
| 11 | 455560747291 |
| 12 | 16750696633309 |
| 13 | 673549397276653 |
| 14 | 29403437531813983 |
| 15 | 1384945157486054431 |
| 16 | 70010050730247746641 |
| 17 | 3780682522365453684625 |
| 18 | 217218502250130209410387 |
[1,1,3,19,181,2341,38071,748567,17262505, 457068745,13667029291,455560747291,16750696633309, 673549397276653,29403437531813983, 1384945157486054431,70010050730247746641, 3780682522365453684625,217218502250130209410387] |