| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 9 |
| 3 | 33 |
| 4 | 56 |
| 5 | 203 |
| 6 | 441 |
| 7 | 1596 |
| 8 | 2585 |
| 9 | 9353 |
| 10 | 20304 |
| 11 | 73461 |
| 12 | 124033 |
| 13 | 448756 |
| 14 | 974169 |
| 15 | 3524577 |
| 16 | 5702888 |
| 17 | 20633243 |
| 18 | 44791065 |
| 19 | 162055596 |
| 20 | 273617239 |
| 21 | 989956471 |
| 22 | 2149017696 |
| 23 | 7775219067 |
| 24 | 12591974497 |
| 25 | 45558191716 |
| 26 | 98898651657 |
[1,4,9,33,56,203,441,1596,2585,9353,20304,73461, 124033,448756,974169,3524577,5702888,20633243, 44791065,162055596,273617239,989956471,2149017696, 7775219067,12591974497,45558191716,98898651657] |