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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 8 |
| 2 | 72 |
| 3 | 528 |
| 4 | 4176 |
| 5 | 32800 |
| 6 | 262800 |
| 7 | 2097200 |
| 8 | 16781472 |
| 9 | 134218800 |
| 10 | 1073774880 |
| 11 | 8589934672 |
| 12 | 68719748256 |
| 13 | 549755813984 |
| 14 | 4398048608688 |
| 15 | 35184372156480 |
| 16 | 281474993496384 |
| 17 | 2251799813685376 |
| 18 | 18014398644225456 |
| 19 | 144115188075856016 |
[0,8,72,528,4176,32800,262800,2097200,16781472, 134218800,1073774880,8589934672,68719748256, 549755813984,4398048608688,35184372156480, 281474993496384,2251799813685376, 18014398644225456,144115188075856016] |