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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 8 |
| 4 | 61 |
| 5 | 623 |
| 6 | 7771 |
| 7 | 117646 |
| 8 | 2097145 |
| 9 | 43046717 |
| 10 | 999999991 |
| 11 | 25937424596 |
| 12 | 743008370677 |
| 13 | 23298085122475 |
| 14 | 793714773254131 |
| 15 | 29192926025390618 |
| 16 | 1152921504606846961 |
| 17 | 48661191875666868473 |
| 18 | 2185911559738696531951 |
[1,1,8,61,623,7771,117646,2097145,43046717, 999999991,25937424596,743008370677,23298085122475, 793714773254131,29192926025390618, 1152921504606846961,48661191875666868473, 2185911559738696531951] |