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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 16 |
| 3 | 340 |
| 4 | 832 |
| 5 | 6784 |
| 6 | 224764 |
| 7 | 496276 |
| 8 | 4373632 |
| 9 | 231072928 |
| 10 | 353406676 |
| 11 | 3224421556 |
| 12 | 280342927660 |
| 13 | 274352334052 |
| 14 | 2553096089392 |
| 15 | 372538530340720 |
| 16 | 224184063052672 |
| 17 | 2113024132266112 |
| 18 | 524189682100412404 |
| 19 | 189520876535392852 |
[4,16,340,832,6784,224764,496276,4373632, 231072928,353406676,3224421556,280342927660, 274352334052,2553096089392,372538530340720, 224184063052672,2113024132266112, 524189682100412404,189520876535392852] |