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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 15 |
| 2 | 185 |
| 3 | 2304 |
| 4 | 29482 |
| 5 | 386945 |
| 6 | 5188169 |
| 7 | 70803164 |
| 8 | 980545070 |
| 9 | 13747777966 |
| 10 | 194776025482 |
| 11 | 2784380900560 |
| 12 | 40113386761524 |
| 13 | 581823363803941 |
| 14 | 8489505340500521 |
| 15 | 124528817146723876 |
| 16 | 1835299404114540102 |
| 17 | 27163404479642455346 |
| 18 | 403573421012802035630 |
[1,15,185,2304,29482,386945,5188169,70803164, 980545070,13747777966,194776025482,2784380900560, 40113386761524,581823363803941,8489505340500521, 124528817146723876,1835299404114540102, 27163404479642455346,403573421012802035630] |