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| n | a(n) |
|---|---|
| 1 | 64 |
| 2 | 432 |
| 3 | 428 |
| 4 | 2325 |
| 5 | 8058 |
| 6 | 35462 |
| 7 | 132348 |
| 8 | 573938 |
| 9 | 2341508 |
| 10 | 9662652 |
| 11 | 39282514 |
| 12 | 162495617 |
| 13 | 669930287 |
| 14 | 2768921759 |
| 15 | 11414416244 |
| 16 | 47122544293 |
| 17 | 194594846556 |
| 18 | 804284802952 |
| 19 | 3323226448845 |
| 20 | 13732491912928 |
| 21 | 56753164938552 |
[64,432,428,2325,8058,35462,132348,573938,2341508, 9662652,39282514,162495617,669930287,2768921759, 11414416244,47122544293,194594846556,804284802952, 3323226448845,13732491912928,56753164938552] |