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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 64 |
| 2 | 2048 |
| 3 | 43712 |
| 4 | 700416 |
| 5 | 8991552 |
| 6 | 96376832 |
| 7 | 887582144 |
| 8 | 7172939776 |
| 9 | 51697913408 |
| 10 | 336604997632 |
| 11 | 2000727369920 |
| 12 | 10951050137600 |
| 13 | 55605785375040 |
| 14 | 263584490403840 |
| 15 | 1172818839714752 |
| 16 | 4921916082929664 |
| 17 | 19564527852207168 |
[1,64,2048,43712,700416,8991552,96376832, 887582144,7172939776,51697913408,336604997632, 2000727369920,10951050137600,55605785375040, 263584490403840,1172818839714752,4921916082929664, 19564527852207168] |