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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 4 |
| 2 | 64 |
| 3 | 976 |
| 4 | 16384 |
| 5 | 305344 |
| 6 | 6313984 |
| 7 | 143915776 |
| 8 | 3592290304 |
| 9 | 97533174784 |
| 10 | 2863801237504 |
| 11 | 90450422603776 |
| 12 | 3058671365914624 |
| 13 | 110277389360103424 |
| 14 | 4223330682610253824 |
[0,4,64,976,16384,305344,6313984,143915776, 3592290304,97533174784,2863801237504, 90450422603776,3058671365914624, 110277389360103424,4223330682610253824] |