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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | -4 |
| 3 | -8 |
| 4 | -26 |
| 5 | -52 |
| 6 | -126 |
| 7 | -320 |
| 8 | -1214 |
| 9 | -2016 |
| 10 | -7068 |
| 11 | -16064 |
| 12 | -48142 |
| 13 | -122552 |
| 14 | -390574 |
| 15 | -903176 |
| 16 | -3549556 |
| 17 | -7597004 |
| 18 | -22902332 |
| 19 | -61172890 |
| 20 | -198872948 |
| 21 | -486889660 |
| 22 | -1555059566 |
| 23 | -4093173788 |
| 24 | -12448334478 |
| 25 | -33815484714 |
| 26 | -105268420776 |
| 27 | -279683446078 |
| 28 | -894795490384 |
| 29 | -2366564864546 |
[3,-4,-8,-26,-52,-126,-320,-1214,-2016,-7068, -16064,-48142,-122552,-390574,-903176,-3549556, -7597004,-22902332,-61172890,-198872948, -486889660,-1555059566,-4093173788,-12448334478, -33815484714,-105268420776,-279683446078, -894795490384,-2366564864546] |