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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 4 |
| 3 | 0 |
| 4 | 28 |
| 5 | 56 |
| 6 | 116 |
| 7 | 208 |
| 8 | 364 |
| 9 | 440 |
| 10 | 1716 |
| 11 | 2960 |
| 12 | 3884 |
| 13 | 15480 |
| 14 | 31348 |
| 15 | 60496 |
| 16 | 129772 |
| 17 | 262072 |
| 18 | 524212 |
| 19 | 1048208 |
| 20 | 2096684 |
| 21 | 4192632 |
| 22 | 8381300 |
| 23 | 16750416 |
| 24 | 33504748 |
| 25 | 67007928 |
| 26 | 133723572 |
| 27 | 266796688 |
| 28 | 533133868 |
| 29 | 1060040056 |
| 30 | 2088494452 |
| 31 | 4211052368 |
| 32 | 8573050348 |
[1,0,4,0,28,56,116,208,364,440,1716,2960,3884, 15480,31348,60496,129772,262072,524212,1048208, 2096684,4192632,8381300,16750416,33504748, 67007928,133723572,266796688,533133868,1060040056, 2088494452,4211052368,8573050348] |