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| n | a(n) |
|---|---|
| 0 | 15 |
| 1 | 3375 |
| 2 | 759375 |
| 3 | 170859375 |
| 4 | 38443359375 |
| 5 | 8649755859375 |
| 6 | 1946195068359375 |
| 7 | 437893890380859375 |
| 8 | 98526125335693359375 |
| 9 | 22168378200531005859375 |
| 10 | 4987885095119476318359375 |
| 11 | 1122274146401882171630859375 |
[15,3375,759375,170859375,38443359375, 8649755859375,1946195068359375,437893890380859375, 98526125335693359375,22168378200531005859375, 4987885095119476318359375, 1122274146401882171630859375] |