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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 8 |
| 2 | 2496 |
| 3 | 177120 |
| 4 | 7616000 |
| 5 | 255780000 |
| 6 | 7410154752 |
| 7 | 194544814464 |
| 8 | 4760448675840 |
| 9 | 110493063252000 |
| 10 | 2461297261280000 |
| 11 | 53051182041906048 |
| 12 | 1113060644163127296 |
| 13 | 22833886572836393600 |
| 14 | 459594580755139200000 |
| 15 | 9100826722891800000000 |
| 16 | 177680489488222659379200 |
| 17 | 3426237501864596491802400 |
[0,8,2496,177120,7616000,255780000,7410154752, 194544814464,4760448675840,110493063252000, 2461297261280000,53051182041906048, 1113060644163127296,22833886572836393600, 459594580755139200000,9100826722891800000000, 177680489488222659379200, 3426237501864596491802400] |