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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 6 |
| 4 | 6 |
| 5 | 2 |
| 6 | -4 |
| 7 | -2 |
| 8 | 20 |
| 9 | 50 |
| 10 | 24 |
| 11 | -130 |
| 12 | -302 |
| 13 | -14 |
| 14 | 1176 |
| 15 | 2166 |
| 16 | -874 |
| 17 | -10494 |
| 18 | -15464 |
| 19 | 15886 |
| 20 | 95006 |
| 21 | 107586 |
| 22 | -210624 |
| 23 | -860234 |
| 24 | -686084 |
| 25 | 2499602 |
| 26 | 7733116 |
| 27 | 3460038 |
| 28 | -27992190 |
| 29 | -68487790 |
| 30 | -3894404 |
| 31 | 301924750 |
| 32 | 592203732 |
| 33 | -243714366 |
| 34 | -3165123736 |
| 35 | -4936196082 |
[1,2,4,6,6,2,-4,-2,20,50,24,-130,-302,-14,1176, 2166,-874,-10494,-15464,15886,95006,107586, -210624,-860234,-686084,2499602,7733116,3460038, -27992190,-68487790,-3894404,301924750,592203732, -243714366,-3165123736,-4936196082] |