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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 3 |
| 3 | 11 |
| 4 | 193 |
| 5 | 2389 |
| 6 | 50191 |
| 7 | 1088205 |
| 8 | 29836353 |
| 9 | 902845673 |
| 10 | 31428924631 |
| 11 | 1207426391137 |
| 12 | 51394833121105 |
| 13 | 2386048646491197 |
| 14 | 120379283952129567 |
| 15 | 6547887322803355589 |
| 16 | 382306453347573490177 |
| 17 | 23839225109022069540817 |
| 18 | 1581540933047988924532135 |
[1,0,3,11,193,2389,50191,1088205,29836353, 902845673,31428924631,1207426391137, 51394833121105,2386048646491197, 120379283952129567,6547887322803355589, 382306453347573490177,23839225109022069540817, 1581540933047988924532135] |