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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 23 |
| 2 | 793 |
| 3 | 1518 |
| 4 | 522719 |
| 5 | 199870 |
| 6 | 96232753 |
| 7 | 26249762 |
| 8 | 9016223039 |
| 9 | 3438811926 |
| 10 | 2595286766165 |
| 11 | 449369431786 |
| 12 | 14010665440130669 |
| 13 | 58576139867102 |
| 14 | 4008948124026391 |
| 15 | 7616814548050290 |
| 16 | 44256355890489448543 |
| 17 | 988047411924892198 |
| 18 | 8972132854551615379531 |
| 19 | 127865443888496612474 |
[1,23,793,1518,522719,199870,96232753,26249762, 9016223039,3438811926,2595286766165,449369431786, 14010665440130669,58576139867102,4008948124026391, 7616814548050290,44256355890489448543, 988047411924892198,8972132854551615379531, 127865443888496612474] |