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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 4 |
| 4 | 14 |
| 5 | 36 |
| 6 | 89 |
| 7 | 200 |
| 8 | 434 |
| 9 | 898 |
| 10 | 1810 |
| 11 | 3548 |
| 12 | 6810 |
| 13 | 12816 |
| 14 | 23719 |
| 15 | 43250 |
| 16 | 77795 |
| 17 | 138244 |
| 18 | 242920 |
| 19 | 422510 |
| 20 | 727907 |
| 21 | 1243094 |
| 22 | 2105493 |
| 23 | 3538936 |
| 24 | 5905481 |
| 25 | 9787810 |
| 26 | 16118588 |
| 27 | 26383244 |
| 28 | 42936039 |
| 29 | 69491436 |
| 30 | 111884015 |
| 31 | 179239648 |
| 32 | 285775148 |
| 33 | 453550910 |
| 34 | 716670609 |
[1,4,14,36,89,200,434,898,1810,3548,6810,12816, 23719,43250,77795,138244,242920,422510,727907, 1243094,2105493,3538936,5905481,9787810,16118588, 26383244,42936039,69491436,111884015,179239648, 285775148,453550910,716670609] |