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| n | a(n) |
|---|---|
| 0 | 3 |
| 1 | 10 |
| 2 | 54 |
| 3 | 352 |
| 4 | 2418 |
| 5 | 16840 |
| 6 | 117714 |
| 7 | 823672 |
| 8 | 5765058 |
| 9 | 40354120 |
| 10 | 282476274 |
| 11 | 1977328792 |
| 12 | 13841291298 |
| 13 | 96889018600 |
| 14 | 678223089234 |
| 15 | 4747561542712 |
| 16 | 33232930635138 |
| 17 | 232630514118280 |
| 18 | 1628413598172594 |
| 19 | 11398895185897432 |
[3,10,54,352,2418,16840,117714,823672,5765058, 40354120,282476274,1977328792,13841291298, 96889018600,678223089234,4747561542712, 33232930635138,232630514118280,1628413598172594, 11398895185897432] |