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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | 8 |
| 3 | 48 |
| 4 | 832 |
| 5 | 34304 |
| 6 | 1992704 |
| 7 | 149382912 |
| 8 | 14491045888 |
| 9 | 1792468533248 |
| 10 | 275860960329728 |
| 11 | 51650706246205440 |
| 12 | 11555611726669152256 |
| 13 | 3044203421408056377344 |
| 14 | 932732257836665756450816 |
[0,2,8,48,832,34304,1992704,149382912,14491045888, 1792468533248,275860960329728,51650706246205440, 11555611726669152256,3044203421408056377344, 932732257836665756450816] |