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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 256 |
| 6 | 15381 |
| 7 | 815867 |
| 8 | 47818683 |
| 9 | 3291232419 |
| 10 | 270038320842 |
| 11 | 26366544332292 |
| 12 | 3038643940889754 |
| 13 | 409107090075310746 |
| 14 | 63681176297547793493 |
| 15 | 11350054578585382645977 |
| 16 | 2296208875599834678215827 |
| 17 | 523217007018082627351544259 |
| 18 | 133356820608541419593405364486 |
[0,0,0,0,256,15381,815867,47818683,3291232419, 270038320842,26366544332292,3038643940889754, 409107090075310746,63681176297547793493, 11350054578585382645977,2296208875599834678215827, 523217007018082627351544259, 133356820608541419593405364486] |