| n | a(n) |
|---|---|
| 6 | 1 |
| 7 | 8 |
| 8 | 65 |
| 9 | 502 |
| 10 | 3851 |
| 11 | 29921 |
| 12 | 237426 |
| 13 | 1932529 |
| 14 | 16173029 |
| 15 | 139320277 |
| 16 | 1235847277 |
| 17 | 11288120480 |
| 18 | 106132359679 |
| 19 | 1026681599731 |
| 20 | 10212591089574 |
| 21 | 104393925768077 |
| 22 | 1095895294558168 |
| 23 | 11806719056706773 |
| 24 | 130457490607638988 |
| 25 | 1477428802636263486 |
| 26 | 17138268233851671782 |
[1,8,65,502,3851,29921,237426,1932529,16173029, 139320277,1235847277,11288120480,106132359679, 1026681599731,10212591089574,104393925768077, 1095895294558168,11806719056706773, 130457490607638988,1477428802636263486, 17138268233851671782] |