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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 5 |
| 5 | 19 |
| 6 | 49 |
| 7 | 203 |
| 8 | 733 |
| 9 | 3315 |
| 10 | 15241 |
| 11 | 76731 |
| 12 | 419973 |
| 13 | 2375027 |
| 14 | 14842721 |
| 15 | 94159595 |
| 16 | 655550445 |
| 17 | 4632480883 |
| 18 | 35405788601 |
| 19 | 276183156827 |
| 20 | 2295741573013 |
| 21 | 19588533436019 |
| 22 | 175928886218769 |
| 23 | 1628494746863243 |
| 24 | 15721340742796029 |
| 25 | 156753433757122035 |
| 26 | 1619488446357906409 |
[1,1,1,3,5,19,49,203,733,3315,15241,76731,419973, 2375027,14842721,94159595,655550445,4632480883, 35405788601,276183156827,2295741573013, 19588533436019,175928886218769,1628494746863243, 15721340742796029,156753433757122035, 1619488446357906409] |