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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 16 |
| 2 | 135 |
| 3 | 799 |
| 4 | 3723 |
| 5 | 14536 |
| 6 | 49436 |
| 7 | 150349 |
| 8 | 416687 |
| 9 | 1067345 |
| 10 | 2554607 |
| 11 | 5762643 |
| 12 | 12337630 |
| 13 | 25214332 |
| 14 | 49424984 |
| 15 | 93299841 |
| 16 | 170193528 |
| 17 | 300895513 |
| 18 | 516904159 |
| 19 | 864758855 |
| 20 | 1411630172 |
| 21 | 2252360038 |
| 22 | 3518118738 |
| 23 | 5386799571 |
| 24 | 8095202359 |
[1,16,135,799,3723,14536,49436,150349,416687, 1067345,2554607,5762643,12337630,25214332, 49424984,93299841,170193528,300895513,516904159, 864758855,1411630172,2252360038,3518118738, 5386799571,8095202359] |