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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 28 |
| 3 | 164 |
| 4 | 629 |
| 5 | 2788 |
| 6 | 11208 |
| 7 | 46777 |
| 8 | 188985 |
| 9 | 767677 |
| 10 | 3091345 |
| 11 | 12439533 |
| 12 | 49886389 |
| 13 | 199801125 |
| 14 | 799494217 |
| 15 | 3197536009 |
[1,4,28,164,629,2788,11208,46777,188985,767677, 3091345,12439533,49886389,199801125,799494217, 3197536009] |