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| n | a(n) |
|---|---|
| 5 | 0 |
| 6 | 168 |
| 7 | 107441 |
| 8 | 902774 |
| 9 | 3692732 |
| 10 | 11295174 |
| 11 | 28865676 |
| 12 | 65031988 |
| 13 | 133191360 |
| 14 | 253050012 |
| 15 | 452373900 |
| 16 | 768956436 |
| 17 | 1252803248 |
| 18 | 1968533980 |
[0,168,107441,902774,3692732,11295174,28865676, 65031988,133191360,253050012,452373900,768956436, 1252803248,1968533980] |