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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 8 |
| 4 | 25 |
| 5 | 83 |
| 6 | 323 |
| 7 | 1410 |
| 8 | 7062 |
| 9 | 39660 |
| 10 | 248287 |
| 11 | 1709505 |
| 12 | 12843315 |
| 13 | 104446836 |
| 14 | 913968191 |
| 15 | 8560027375 |
| 16 | 85427505885 |
| 17 | 904899664970 |
| 18 | 10139054456975 |
| 19 | 119802780498730 |
| 20 | 1488769376468607 |
| 21 | 19409525611304801 |
| 22 | 264890181139521141 |
| 23 | 3776619220990535910 |
[1,1,3,8,25,83,323,1410,7062,39660,248287,1709505, 12843315,104446836,913968191,8560027375, 85427505885,904899664970,10139054456975, 119802780498730,1488769376468607, 19409525611304801,264890181139521141, 3776619220990535910] |