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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 11 |
| 3 | 37 |
| 4 | 566 |
| 5 | 1736 |
| 6 | 8339 |
| 7 | 16084 |
| 8 | 17552 |
| 9 | 17932 |
| 10 | 36997 |
| 11 | 40441 |
| 12 | 119811 |
| 13 | 173736 |
| 14 | 378811 |
| 15 | 1328120 |
| 16 | 1751496 |
| 17 | 1775706 |
| 18 | 4427780 |
| 19 | 8211879 |
| 20 | 17909282 |
| 21 | 40439557 |
[4,11,37,566,1736,8339,16084,17552,17932,36997, 40441,119811,173736,378811,1328120,1751496, 1775706,4427780,8211879,17909282,40439557] |