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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 9 |
| 3 | 44 |
| 4 | 303 |
| 5 | 2697 |
| 6 | 29438 |
| 7 | 380529 |
| 8 | 5683359 |
| 9 | 96290588 |
| 10 | 1824544857 |
| 11 | 38229811083 |
| 12 | 877643031554 |
| 13 | 21906313145979 |
| 14 | 590665804363833 |
| 15 | 17109084307014332 |
| 16 | 529833078045763263 |
| 17 | 17468521692479218209 |
| 18 | 610901505126064857854 |
| 19 | 22586913755160674065113 |
[1,2,9,44,303,2697,29438,380529,5683359,96290588, 1824544857,38229811083,877643031554, 21906313145979,590665804363833,17109084307014332, 529833078045763263,17468521692479218209, 610901505126064857854,22586913755160674065113] |