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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 16 |
| 4 | 256 |
| 5 | 4216 |
| 6 | 67456 |
| 7 | 1083136 |
| 8 | 17330176 |
| 9 | 277344816 |
| 10 | 4437547776 |
| 11 | 71001776256 |
| 12 | 1136028420096 |
| 13 | 18176471920896 |
| 14 | 290823550734336 |
| 15 | 4653177071702016 |
| 16 | 74450833163421696 |
| 17 | 1191213334782285596 |
| 18 | 19059413356516569536 |
| 19 | 304950613771087329536 |
| 20 | 4879209820337397272576 |
[1,1,16,256,4216,67456,1083136,17330176,277344816, 4437547776,71001776256,1136028420096, 18176471920896,290823550734336,4653177071702016, 74450833163421696,1191213334782285596, 19059413356516569536,304950613771087329536, 4879209820337397272576] |