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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 24 |
| 3 | 78 |
| 4 | 216 |
| 5 | 504 |
| 6 | 906 |
| 7 | 756 |
| 8 | -2808 |
| 9 | -17832 |
| 10 | -57312 |
| 11 | -104832 |
| 12 | 81882 |
| 13 | 1734156 |
| 14 | 9360576 |
| 15 | 35755956 |
| 16 | 106475472 |
| 17 | 232967664 |
| 18 | 215497680 |
| 19 | -1178534304 |
| 20 | -8734303296 |
| 21 | -36146763648 |
| 22 | -108833048064 |
| 23 | -220247838720 |
| 24 | -46688571558 |
| 25 | 2220777704700 |
| 26 | 13473296923536 |
| 27 | 53523581091900 |
[1,6,24,78,216,504,906,756,-2808,-17832,-57312, -104832,81882,1734156,9360576,35755956,106475472, 232967664,215497680,-1178534304,-8734303296, -36146763648,-108833048064,-220247838720, -46688571558,2220777704700,13473296923536, 53523581091900] |