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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 86 |
| 3 | 1064 |
| 4 | 14289 |
| 5 | 202488 |
| 6 | 2980380 |
| 7 | 45122792 |
| 8 | 698214548 |
| 9 | 10993069856 |
| 10 | 175546104958 |
| 11 | 2836384141720 |
| 12 | 46285381498750 |
| 13 | 761735217877200 |
| 14 | 12628402069223160 |
| 15 | 210704642400488040 |
| 16 | 3535494883741420908 |
| 17 | 59621314428576557664 |
| 18 | 1009942893735988354296 |
[1,8,86,1064,14289,202488,2980380,45122792, 698214548,10993069856,175546104958,2836384141720, 46285381498750,761735217877200,12628402069223160, 210704642400488040,3535494883741420908, 59621314428576557664,1009942893735988354296] |