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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 15 |
| 2 | 85 |
| 3 | 575 |
| 4 | 3725 |
| 5 | 24375 |
| 6 | 159125 |
| 7 | 1039375 |
| 8 | 6788125 |
| 9 | 44334375 |
| 10 | 289553125 |
| 11 | 1891109375 |
| 12 | 12351078125 |
| 13 | 80666484375 |
| 14 | 526843203125 |
| 15 | 3440880859375 |
| 16 | 22472836328125 |
| 17 | 146772990234375 |
| 18 | 958593314453125 |
| 19 | 6260696474609375 |
[1,15,85,575,3725,24375,159125,1039375,6788125, 44334375,289553125,1891109375,12351078125, 80666484375,526843203125,3440880859375, 22472836328125,146772990234375,958593314453125, 6260696474609375] |