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| n | a(n) |
|---|---|
| 6 | 1 |
| 7 | 4 |
| 8 | 14 |
| 9 | 42 |
| 10 | 123 |
| 11 | 351 |
| 12 | 988 |
| 13 | 2761 |
| 14 | 7682 |
| 15 | 21313 |
| 16 | 59029 |
| 17 | 163314 |
| 18 | 451529 |
| 19 | 1247842 |
| 20 | 3447574 |
| 21 | 9523375 |
| 22 | 26303825 |
| 23 | 72646588 |
| 24 | 200627795 |
| 25 | 554056162 |
| 26 | 1530058222 |
| 27 | 4225290890 |
| 28 | 11668141901 |
| 29 | 32221405479 |
| 30 | 88978639438 |
| 31 | 245711832196 |
| 32 | 678524838258 |
[1,4,14,42,123,351,988,2761,7682,21313,59029, 163314,451529,1247842,3447574,9523375,26303825, 72646588,200627795,554056162,1530058222, 4225290890,11668141901,32221405479,88978639438, 245711832196,678524838258] |