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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 15 |
| 3 | 214 |
| 4 | 4721 |
| 5 | 146046 |
| 6 | 5958367 |
| 7 | 307382090 |
| 8 | 19459587009 |
| 9 | 1478414285146 |
| 10 | 132440451881231 |
| 11 | 13787717744245182 |
| 12 | 1647673524863409265 |
| 13 | 223671725058601427414 |
| 14 | 34184743554559413628191 |
| 15 | 5837132027535188545269106 |
| 16 | 1106136052471647285563082497 |
[1,2,15,214,4721,146046,5958367,307382090, 19459587009,1478414285146,132440451881231, 13787717744245182,1647673524863409265, 223671725058601427414,34184743554559413628191, 5837132027535188545269106, 1106136052471647285563082497] |