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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 7 |
| 5 | 211 |
| 6 | 8411 |
| 7 | 412301 |
| 8 | 24894581 |
| 9 | 1832290133 |
| 10 | 162840289853 |
| 11 | 17318483860823 |
| 12 | 2184687906940713 |
| 13 | 323935018037153709 |
| 14 | 55939700211256251813 |
| 15 | 11149440249347239643775 |
| 16 | 2542901827027280314993359 |
| 17 | 658411118385997264277976111 |
| 18 | 192135231563520713206597464479 |
| 19 | 62778202074038700301319695876973 |
| 20 | 22831139565407893815484402030333403 |
[1,1,1,1,7,211,8411,412301,24894581,1832290133, 162840289853,17318483860823,2184687906940713, 323935018037153709,55939700211256251813, 11149440249347239643775,2542901827027280314993359, 658411118385997264277976111, 192135231563520713206597464479, 62778202074038700301319695876973, 22831139565407893815484402030333403] |