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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 10 |
| 3 | 34 |
| 4 | 118 |
| 5 | 418 |
| 6 | 1508 |
| 7 | 5524 |
| 8 | 20486 |
| 9 | 76722 |
| 10 | 289580 |
| 11 | 1099836 |
| 12 | 4198396 |
| 13 | 16093236 |
| 14 | 61902472 |
| 15 | 238805864 |
| 16 | 923574598 |
| 17 | 3579675026 |
| 18 | 13900879132 |
| 19 | 54071886764 |
| 20 | 210645038548 |
| 21 | 821701422716 |
| 22 | 3209243934712 |
| 23 | 12547819633304 |
| 24 | 49109812222108 |
| 25 | 192382627198868 |
[1,3,10,34,118,418,1508,5524,20486,76722,289580, 1099836,4198396,16093236,61902472,238805864, 923574598,3579675026,13900879132,54071886764, 210645038548,821701422716,3209243934712, 12547819633304,49109812222108,192382627198868] |