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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 3 |
| 3 | 9 |
| 4 | 17 |
| 5 | 15 |
| 6 | 142 |
| 7 | 52 |
| 8 | 2371 |
| 9 | 1481 |
| 10 | 3673 |
| 11 | 576 |
| 12 | 23341 |
| 13 | 10085 |
| 14 | 344857 |
| 15 | 3298871 |
| 16 | -296356 |
| 17 | -61122461 |
| 18 | 406758376 |
| 19 | 11033588009 |
| 20 | 451828963 |
| 21 | -128048475089 |
| 22 | -900388555615 |
| 23 | 4122838816531 |
| 24 | 1124813051005634 |
| 25 | -220071533198789 |
| 26 | -22575111900222262 |
| 27 | 271507756187465 |
| 28 | 100726408133038141 |
[0,1,3,9,17,15,142,52,2371,1481,3673,576,23341, 10085,344857,3298871,-296356,-61122461,406758376, 11033588009,451828963,-128048475089,-900388555615, 4122838816531,1124813051005634,-220071533198789, -22575111900222262,271507756187465, 100726408133038141] |