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| n | a(n) |
|---|---|
| 4 | 0 |
| 5 | 18 |
| 6 | 79648 |
| 7 | 1568158 |
| 8 | 9251144 |
| 9 | 34765154 |
| 10 | 101461384 |
| 11 | 250731864 |
| 12 | 549801520 |
| 13 | 1100971428 |
| 14 | 2052324440 |
| 15 | 3609891704 |
| 16 | 6051280064 |
[0,18,79648,1568158,9251144,34765154,101461384, 250731864,549801520,1100971428,2052324440, 3609891704,6051280064] |