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| n | a(n) |
|---|---|
| 7 | 1 |
| 8 | 28 |
| 9 | 463 |
| 10 | 5909 |
| 11 | 64479 |
| 12 | 633796 |
| 13 | 5786275 |
| 14 | 50033463 |
| 15 | 415225854 |
| 16 | 3338335646 |
| 17 | 26179143977 |
| 18 | 201266007483 |
| 19 | 1522856635641 |
| 20 | 11374331041836 |
| 21 | 84061202478127 |
| 22 | 615860361908534 |
| 23 | 4479596579257904 |
| 24 | 32388729758708314 |
| 25 | 233011769893620853 |
| 26 | 1669336230635613631 |
[1,28,463,5909,64479,633796,5786275,50033463, 415225854,3338335646,26179143977,201266007483, 1522856635641,11374331041836,84061202478127, 615860361908534,4479596579257904, 32388729758708314,233011769893620853, 1669336230635613631] |