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| n | a(n) |
|---|---|
| 1 | 245 |
| 2 | 975 |
| 3 | 4129 |
| 4 | 19005 |
| 5 | 91617 |
| 6 | 464737 |
| 7 | 2442897 |
| 8 | 13272897 |
| 9 | 73869017 |
| 10 | 419482609 |
| 11 | 2416657937 |
| 12 | 14082031833 |
| 13 | 82711630513 |
| 14 | 488789176177 |
| 15 | 2900660394265 |
| 16 | 17268508407633 |
| 17 | 103027230851025 |
| 18 | 615687930858265 |
| 19 | 3683409663312753 |
[245,975,4129,19005,91617,464737,2442897,13272897, 73869017,419482609,2416657937,14082031833, 82711630513,488789176177,2900660394265, 17268508407633,103027230851025,615687930858265, 3683409663312753] |