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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 64 |
| 3 | 512 |
| 4 | 3200 |
| 5 | 19392 |
| 6 | 112128 |
| 7 | 598016 |
| 8 | 3088896 |
| 9 | 15362408 |
| 10 | 73331264 |
| 11 | 340653056 |
| 12 | 1538392064 |
| 13 | 6762336448 |
| 14 | 29072665600 |
| 15 | 122299068416 |
| 16 | 504128374784 |
| 17 | 2040557142592 |
| 18 | 8116582974656 |
| 19 | 31760991869952 |
| 20 | 122408808197120 |
| 21 | 464983163273216 |
| 22 | 1742277357389312 |
[1,8,64,512,3200,19392,112128,598016,3088896, 15362408,73331264,340653056,1538392064,6762336448, 29072665600,122299068416,504128374784, 2040557142592,8116582974656,31760991869952, 122408808197120,464983163273216,1742277357389312] |