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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 17 |
| 5 | 31 |
| 6 | 691 |
| 7 | 5461 |
| 8 | 929569 |
| 9 | 3202291 |
| 10 | 221930581 |
| 11 | 4722116521 |
| 12 | 56963745931 |
| 13 | 14717667114151 |
| 14 | 2093660879252671 |
| 15 | 86125672563201181 |
| 16 | 129848163681107301953 |
| 17 | 868320396104950823611 |
| 18 | 209390615747646519456961 |
| 19 | 14129659550745551130667441 |
| 20 | 16103843159579478297227731 |
[1,1,1,17,31,691,5461,929569,3202291,221930581, 4722116521,56963745931,14717667114151, 2093660879252671,86125672563201181, 129848163681107301953,868320396104950823611, 209390615747646519456961, 14129659550745551130667441, 16103843159579478297227731] |