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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 10 |
| 3 | 29 |
| 4 | 96 |
| 5 | 349 |
| 6 | 1350 |
| 7 | 5425 |
| 8 | 22297 |
| 9 | 92841 |
| 10 | 389456 |
| 11 | 1640630 |
| 12 | 6927937 |
| 13 | 29294645 |
| 14 | 123967625 |
| 15 | 524830618 |
| 16 | 2222483751 |
| 17 | 9412820990 |
| 18 | 39869076285 |
| 19 | 168877805414 |
| 20 | 715352976032 |
| 21 | 3030223762722 |
| 22 | 12836088840031 |
| 23 | 54374194848619 |
[4,10,29,96,349,1350,5425,22297,92841,389456, 1640630,6927937,29294645,123967625,524830618, 2222483751,9412820990,39869076285,168877805414, 715352976032,3030223762722,12836088840031, 54374194848619] |