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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 56 |
| 2 | 3360 |
| 3 | 206080 |
| 4 | 12776960 |
| 5 | 797282304 |
| 6 | 49963024384 |
| 7 | 3140532961280 |
| 8 | 197853576560640 |
| 9 | 12486759054049280 |
| 10 | 789163172215914496 |
| 11 | 49932506169297862656 |
| 12 | 3162392057388864634880 |
| 13 | 200447004252955727626240 |
| 14 | 12714067126901763295150080 |
| 15 | 806919460320698577132191744 |
[1,56,3360,206080,12776960,797282304,49963024384, 3140532961280,197853576560640,12486759054049280, 789163172215914496,49932506169297862656, 3162392057388864634880,200447004252955727626240, 12714067126901763295150080, 806919460320698577132191744] |