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| n | a(n) |
|---|---|
| 3 | 0 |
| 4 | 0 |
| 5 | 42 |
| 6 | 408 |
| 7 | 3094 |
| 8 | 7144 |
| 9 | 37881 |
| 10 | 70020 |
| 11 | 246466 |
| 12 | 272100 |
| 13 | 1118117 |
| 14 | 1456056 |
| 15 | 3982905 |
| 16 | 4720608 |
| 17 | 11925058 |
| 18 | 9252873 |
[0,0,42,408,3094,7144,37881,70020,246466,272100, 1118117,1456056,3982905,4720608,11925058,9252873] |