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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 16 |
| 2 | 122 |
| 3 | 800 |
| 4 | 5296 |
| 5 | 36976 |
| 6 | 275792 |
| 7 | 2204480 |
| 8 | 18870016 |
| 9 | 172585936 |
| 10 | 1681843712 |
| 11 | 17411416160 |
| 12 | 190939611136 |
| 13 | 2211961358896 |
| 14 | 26999750469632 |
| 15 | 346419349043840 |
| 16 | 4661658528710656 |
| 17 | 65657186909139856 |
| 18 | 966054350401175552 |
| 19 | 14822897275566895520 |
[0,16,122,800,5296,36976,275792,2204480,18870016, 172585936,1681843712,17411416160,190939611136, 2211961358896,26999750469632,346419349043840, 4661658528710656,65657186909139856, 966054350401175552,14822897275566895520] |