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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 8 |
| 3 | 260 |
| 4 | 9760 |
| 5 | 389148 |
| 6 | 15237056 |
| 7 | 597115044 |
| 8 | 23414415888 |
| 9 | 917986434396 |
| 10 | 35990833477072 |
| 11 | 1411075267502276 |
| 12 | 55323263878390080 |
| 13 | 2169029334553784412 |
| 14 | 85039966968695574688 |
| 15 | 3334116217958488966052 |
| 16 | 130718900222071304691248 |
[0,8,260,9760,389148,15237056,597115044, 23414415888,917986434396,35990833477072, 1411075267502276,55323263878390080, 2169029334553784412,85039966968695574688, 3334116217958488966052,130718900222071304691248] |