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| n | a(n) |
|---|---|
| 1 | 64 |
| 2 | 1063 |
| 3 | 3699 |
| 4 | 14822 |
| 5 | 66166 |
| 6 | 291721 |
| 7 | 1296506 |
| 8 | 5589526 |
| 9 | 24694845 |
| 10 | 110652439 |
| 11 | 496922595 |
| 12 | 2235496431 |
| 13 | 10093633015 |
| 14 | 45708631844 |
| 15 | 207362510529 |
| 16 | 942134125486 |
| 17 | 4286125546700 |
| 18 | 19519540829724 |
| 19 | 88968137138219 |
| 20 | 405767287357238 |
[64,1063,3699,14822,66166,291721,1296506,5589526, 24694845,110652439,496922595,2235496431, 10093633015,45708631844,207362510529,942134125486, 4286125546700,19519540829724,88968137138219, 405767287357238] |