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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 8 |
| 4 | 128 |
| 5 | 1890 |
| 6 | 27036 |
| 7 | 379491 |
| 8 | 5229092 |
| 9 | 70805740 |
| 10 | 944106760 |
| 11 | 12426068215 |
| 12 | 161793730426 |
| 13 | 2087922762430 |
| 14 | 26745380615078 |
[0,0,0,8,128,1890,27036,379491,5229092,70805740, 944106760,12426068215,161793730426,2087922762430, 26745380615078] |