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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 4 |
| 3 | 15 |
| 4 | 49 |
| 5 | 64 |
| 6 | 113 |
| 7 | 1646 |
| 8 | 1759 |
| 9 | 3405 |
| 10 | 11974 |
| 11 | 39327 |
| 12 | 51301 |
| 13 | 193230 |
| 14 | 11645101 |
| 15 | 35128533 |
| 16 | 46773634 |
| 17 | 175449435 |
| 18 | 573121939 |
| 19 | 748571374 |
| 20 | 1321693313 |
| 21 | 19252277756 |
| 22 | 20573971069 |
| 23 | 39826248825 |
| 24 | 140052717544 |
| 25 | 459984401457 |
| 26 | 600037119001 |
| 27 | 2260095758460 |
[1,3,4,15,49,64,113,1646,1759,3405,11974,39327, 51301,193230,11645101,35128533,46773634,175449435, 573121939,748571374,1321693313,19252277756, 20573971069,39826248825,140052717544,459984401457, 600037119001,2260095758460] |