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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 16 |
| 3 | 80 |
| 4 | 448 |
| 5 | 2304 |
| 6 | 11520 |
| 7 | 67584 |
| 8 | 372736 |
| 9 | 1966080 |
| 10 | 11141120 |
| 11 | 63504384 |
| 12 | 348651520 |
| 13 | 1917583360 |
| 14 | 11142168576 |
| 15 | 62704844800 |
| 16 | 343513497600 |
| 17 | 1992378286080 |
| 18 | 11402534191104 |
| 19 | 63709397385216 |
| 20 | 361019918516224 |
[1,4,16,80,448,2304,11520,67584,372736,1966080, 11141120,63504384,348651520,1917583360, 11142168576,62704844800,343513497600, 1992378286080,11402534191104,63709397385216, 361019918516224] |