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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 16 |
| 6 | 192 |
| 7 | 1472 |
| 8 | 12800 |
| 9 | 132352 |
| 10 | 1366016 |
| 11 | 14781952 |
| 12 | 178102272 |
| 13 | 2282645504 |
| 14 | 30639611904 |
| 15 | 440041603072 |
| 16 | 6720063012864 |
| 17 | 107722700685312 |
| 18 | 1818098902499328 |
| 19 | 32319047553515520 |
| 20 | 601556224722337792 |
| 21 | 11702621573275975680 |
| 22 | 237913839294912397312 |
[0,0,0,0,0,16,192,1472,12800,132352,1366016, 14781952,178102272,2282645504,30639611904, 440041603072,6720063012864,107722700685312, 1818098902499328,32319047553515520, 601556224722337792,11702621573275975680, 237913839294912397312] |