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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 112 |
| 3 | 1280 |
| 4 | 15616 |
| 5 | 186368 |
| 6 | 2240512 |
| 7 | 26869760 |
| 8 | 322502656 |
| 9 | 3869769728 |
| 10 | 46438285312 |
| 11 | 557255229440 |
| 12 | 6687079530496 |
| 13 | 80244887257088 |
| 14 | 962938915520512 |
| 15 | 11555265912504320 |
| 16 | 138663195245019136 |
| 17 | 1663958325760360448 |
| 18 | 19967499977843802112 |
| 19 | 239609999459247718400 |
[1,8,112,1280,15616,186368,2240512,26869760, 322502656,3869769728,46438285312,557255229440, 6687079530496,80244887257088,962938915520512, 11555265912504320,138663195245019136, 1663958325760360448,19967499977843802112, 239609999459247718400] |