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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 201 |
| 3 | 625 |
| 4 | 2289 |
| 5 | 15789 |
| 6 | 80265 |
| 7 | 387783 |
| 8 | 2078075 |
| 9 | 10788813 |
| 10 | 55225541 |
| 11 | 286876853 |
| 12 | 1486362583 |
| 13 | 7677998551 |
| 14 | 39746569905 |
| 15 | 205732077965 |
| 16 | 1064271909209 |
| 17 | 5507235596393 |
| 18 | 28499097112197 |
| 19 | 147462482752655 |
| 20 | 763041544179951 |
[1,201,625,2289,15789,80265,387783,2078075, 10788813,55225541,286876853,1486362583,7677998551, 39746569905,205732077965,1064271909209, 5507235596393,28499097112197,147462482752655, 763041544179951] |