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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 9 |
| 4 | 37 |
| 5 | 189 |
| 6 | 1134 |
| 7 | 7940 |
| 8 | 63522 |
| 9 | 571701 |
| 10 | 5717018 |
| 11 | 62887206 |
| 12 | 754646473 |
| 13 | 9810404152 |
| 14 | 137345658132 |
| 15 | 2060184871987 |
| 16 | 32962957951792 |
| 17 | 560370285180476 |
| 18 | 10086665133248572 |
| 19 | 191646637531722882 |
| 20 | 3832932750634457659 |
[1,3,9,37,189,1134,7940,63522,571701,5717018, 62887206,754646473,9810404152,137345658132, 2060184871987,32962957951792,560370285180476, 10086665133248572,191646637531722882, 3832932750634457659] |