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| n | a(n) |
|---|---|
| 3 | 0 |
| 4 | 2 |
| 5 | 2 |
| 6 | 0 |
| 7 | 10 |
| 8 | 12 |
| 9 | 24 |
| 10 | 92 |
| 11 | 192 |
| 12 | 520 |
| 13 | 1332 |
| 14 | 3140 |
| 15 | 7972 |
| 16 | 20154 |
| 17 | 50748 |
| 18 | 130860 |
| 19 | 335402 |
| 20 | 866865 |
| 21 | 2249753 |
| 22 | 5853864 |
| 23 | 15304021 |
| 24 | 40137553 |
| 25 | 105683640 |
| 26 | 279077974 |
| 27 | 738710148 |
| 28 | 1960352325 |
| 29 | 5211885181 |
| 30 | 13884679308 |
| 31 | 37062272542 |
[0,2,2,0,10,12,24,92,192,520,1332,3140,7972,20154, 50748,130860,335402,866865,2249753,5853864, 15304021,40137553,105683640,279077974,738710148, 1960352325,5211885181,13884679308,37062272542] |