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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 16 |
| 4 | 124 |
| 5 | 1266 |
| 6 | 16081 |
| 7 | 244798 |
| 8 | 4349556 |
| 9 | 88445899 |
| 10 | 2027133271 |
| 11 | 51732933726 |
| 12 | 1455469821763 |
| 13 | 44769397616386 |
| 14 | 1495012542977409 |
| 15 | 53873142910303291 |
| 16 | 2083965434325009511 |
| 17 | 86141049679863875223 |
| 18 | 3789452627584599490156 |
[1,3,16,124,1266,16081,244798,4349556,88445899, 2027133271,51732933726,1455469821763, 44769397616386,1495012542977409,53873142910303291, 2083965434325009511,86141049679863875223, 3789452627584599490156] |