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| n | a(n) |
|---|---|
| 0 | 3 |
| 1 | 56 |
| 2 | 1568 |
| 3 | 53312 |
| 4 | 1931776 |
| 5 | 71300096 |
| 6 | 2645479424 |
| 7 | 98305622016 |
| 8 | 3654656065536 |
| 9 | 135885355483136 |
| 10 | 5052615982317568 |
| 11 | 187873377732526080 |
| 12 | 6985794697679601664 |
| 13 | 259756778648305139712 |
| 14 | 9658687473893481906176 |
| 15 | 359144636249686988029952 |
| 16 | 13354285908291066433372160 |
[3,56,1568,53312,1931776,71300096,2645479424, 98305622016,3654656065536,135885355483136, 5052615982317568,187873377732526080, 6985794697679601664,259756778648305139712, 9658687473893481906176,359144636249686988029952, 13354285908291066433372160] |