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| n | a(n) |
|---|---|
| 3 | 0 |
| 4 | 6 |
| 5 | 10678 |
| 6 | 169232 |
| 7 | 895970 |
| 8 | 3151504 |
| 9 | 8793698 |
| 10 | 21026206 |
| 11 | 44936970 |
| 12 | 88129194 |
| 13 | 161444970 |
| 14 | 279781318 |
| 15 | 462998626 |
| 16 | 736921490 |
| 17 | 1134431954 |
| 18 | 1696655150 |
| 19 | 2474237338 |
[0,6,10678,169232,895970,3151504,8793698,21026206, 44936970,88129194,161444970,279781318,462998626, 736921490,1134431954,1696655150,2474237338] |