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| n | a(n) |
|---|---|
| 16 | 1 |
| 17 | 1 |
| 18 | 3143981871 |
| 19 | 12219117170 |
| 20 | 26773657259138210984 |
| 21 | 386199802888523031294 |
| 22 | 982474651752126202075575490369 |
| 23 | 50748123995890025746709567402256 |
| 24 | 191795630733414647568032678703215924098176 |
[1,1,3143981871,12219117170,26773657259138210984, 386199802888523031294, 982474651752126202075575490369, 50748123995890025746709567402256, 191795630733414647568032678703215924098176] |