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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 112 |
| 3 | 2336 |
| 4 | 63808 |
| 5 | 2177408 |
| 6 | 88532992 |
| 7 | 4198893056 |
| 8 | 226756461568 |
| 9 | 13774782507008 |
| 10 | 927722457014272 |
| 11 | 68724458864869376 |
| 12 | 5545864378385072128 |
| 13 | 484804579241630302208 |
| 14 | 45594217495265300119552 |
| 15 | 4594089494167496649015296 |
| 16 | 493393425754870454072639488 |
| 17 | 56299361591526976658442027008 |
[1,8,112,2336,63808,2177408,88532992,4198893056, 226756461568,13774782507008,927722457014272, 68724458864869376,5545864378385072128, 484804579241630302208,45594217495265300119552, 4594089494167496649015296, 493393425754870454072639488, 56299361591526976658442027008] |