| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 25 |
| 4 | 157 |
| 5 | 1061 |
| 6 | 7883 |
| 7 | 61727 |
| 8 | 508949 |
| 9 | 4377904 |
| 10 | 39144035 |
| 11 | 362532974 |
| 12 | 3469415119 |
| 13 | 34239639968 |
| 14 | 347923109287 |
| 15 | 3635414562245 |
| 16 | 39018272951829 |
| 17 | 429753842563060 |
| 18 | 4853492527491008 |
| 19 | 56163703072054240 |
| 20 | 665483565486515787 |
[1,5,25,157,1061,7883,61727,508949,4377904, 39144035,362532974,3469415119,34239639968, 347923109287,3635414562245,39018272951829, 429753842563060,4853492527491008, 56163703072054240,665483565486515787] |