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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 128 |
| 3 | 2560 |
| 4 | 57344 |
| 5 | 1376256 |
| 6 | 34603008 |
| 7 | 899678208 |
| 8 | 23991418880 |
| 9 | 652566593536 |
| 10 | 18034567675904 |
| 11 | 504967894925312 |
| 12 | 14294475794808832 |
| 13 | 408413594137395200 |
| 14 | 11762311511156981760 |
| 15 | 341107033823552471040 |
| 16 | 9952299339793060331520 |
[1,8,128,2560,57344,1376256,34603008,899678208, 23991418880,652566593536,18034567675904, 504967894925312,14294475794808832, 408413594137395200,11762311511156981760, 341107033823552471040,9952299339793060331520] |