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| n | a(n) |
|---|---|
| 2 | 2 |
| 3 | 10 |
| 4 | 62 |
| 5 | 466 |
| 6 | 4142 |
| 7 | 42610 |
| 8 | 498542 |
| 9 | 6541426 |
| 10 | 95160302 |
| 11 | 1520385010 |
| 12 | 26468935022 |
| 13 | 498766780786 |
| 14 | 10114484622062 |
| 15 | 219641848007410 |
| 16 | 5085371491003502 |
| 17 | 125055112347154546 |
| 18 | 3255163896227709422 |
| 19 | 89416052656071565810 |
| 20 | 2584886208925055791982 |
| 21 | 78447137202259689678706 |
| 22 | 2493719594804686310662382 |
[2,10,62,466,4142,42610,498542,6541426,95160302, 1520385010,26468935022,498766780786, 10114484622062,219641848007410,5085371491003502, 125055112347154546,3255163896227709422, 89416052656071565810,2584886208925055791982, 78447137202259689678706,2493719594804686310662382] |