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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 9 |
| 4 | 159 |
| 5 | 4051 |
| 6 | 131688 |
| 7 | 5132793 |
| 8 | 231332589 |
| 9 | 11778989157 |
| 10 | 666865748751 |
| 11 | 41494745678544 |
| 12 | 2812781975630049 |
| 13 | 206264308294757115 |
| 14 | 16268935714201604701 |
| 15 | 1373512281722006688063 |
| 16 | 123601628009085259269819 |
| 17 | 11812339040349301277253801 |
| 18 | 1194940136210629914238593762 |
[1,1,9,159,4051,131688,5132793,231332589, 11778989157,666865748751,41494745678544, 2812781975630049,206264308294757115, 16268935714201604701,1373512281722006688063, 123601628009085259269819, 11812339040349301277253801, 1194940136210629914238593762] |