| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 0 |
| 3 | 0 |
| 4 | 2 |
| 5 | 2 |
| 6 | 4 |
| 7 | 8 |
| 8 | 4 |
| 9 | 16 |
| 10 | 12 |
| 11 | 48 |
| 12 | 80 |
| 13 | 136 |
| 14 | 420 |
| 15 | 1240 |
| 16 | 3000 |
| 17 | 8152 |
| 18 | 18104 |
| 19 | 44184 |
| 20 | 144620 |
| 21 | 375664 |
| 22 | 1250692 |
| 23 | 3581240 |
| 24 | 11675080 |
| 25 | 34132592 |
| 26 | 115718268 |
| 27 | 320403024 |
| 28 | 1250901440 |
| 29 | 3600075088 |
| 30 | 14589438024 |
| 31 | 43266334696 |
| 32 | 181254386312 |
[1,0,0,2,2,4,8,4,16,12,48,80,136,420,1240,3000, 8152,18104,44184,144620,375664,1250692,3581240, 11675080,34132592,115718268,320403024,1250901440, 3600075088,14589438024,43266334696,181254386312] |