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| n | a(n) |
|---|---|
| 1 | 255 |
| 2 | 6305 |
| 3 | 58975 |
| 4 | 320481 |
| 5 | 1225631 |
| 6 | 3693505 |
| 7 | 9399615 |
| 8 | 21108545 |
| 9 | 43067071 |
| 10 | 81457761 |
| 11 | 144913055 |
| 12 | 245089825 |
| 13 | 397304415 |
| 14 | 621228161 |
| 15 | 941643391 |
| 16 | 1389259905 |
| 17 | 2001591935 |
| 18 | 2823895585 |
| 19 | 3910166751 |
| 20 | 5324199521 |
| 21 | 7140705055 |
| 22 | 9446490945 |
[255,6305,58975,320481,1225631,3693505,9399615, 21108545,43067071,81457761,144913055,245089825, 397304415,621228161,941643391,1389259905, 2001591935,2823895585,3910166751,5324199521, 7140705055,9446490945] |