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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 6 |
| 4 | 8 |
| 5 | 10 |
| 6 | 78 |
| 7 | 196 |
| 8 | 376 |
| 9 | 1446 |
| 10 | 4390 |
| 11 | 10648 |
| 12 | 32822 |
| 13 | 101426 |
| 14 | 276976 |
| 15 | 808666 |
| 16 | 2449528 |
| 17 | 7046942 |
| 18 | 20491458 |
| 19 | 61124482 |
| 20 | 179376718 |
| 21 | 525065722 |
| 22 | 1556298700 |
| 23 | 4598892274 |
| 24 | 13546834582 |
| 25 | 40109057710 |
| 26 | 118836735758 |
| 27 | 351539306142 |
| 28 | 1041872654824 |
| 29 | 3091535558296 |
[1,0,0,6,8,10,78,196,376,1446,4390,10648,32822, 101426,276976,808666,2449528,7046942,20491458, 61124482,179376718,525065722,1556298700, 4598892274,13546834582,40109057710,118836735758, 351539306142,1041872654824,3091535558296] |