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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 15 |
| 3 | 146 |
| 4 | 1623 |
| 5 | 19526 |
| 6 | 247516 |
| 7 | 3256118 |
| 8 | 44037023 |
| 9 | 608484766 |
| 10 | 8552832116 |
| 11 | 121908218724 |
| 12 | 1757915510695 |
| 13 | 25598937436696 |
| 14 | 375916184707142 |
| 15 | 5560517754432772 |
| 16 | 82774606577536376 |
| 17 | 1239110145377709862 |
| 18 | 18641533742708676711 |
| 19 | 281697878640036748684 |
[1,2,15,146,1623,19526,247516,3256118,44037023, 608484766,8552832116,121908218724,1757915510695, 25598937436696,375916184707142,5560517754432772, 82774606577536376,1239110145377709862, 18641533742708676711,281697878640036748684] |