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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 6 |
| 3 | 80 |
| 4 | 441 |
| 5 | 3249 |
| 6 | 22484 |
| 7 | 156293 |
| 8 | 1097881 |
| 9 | 7657324 |
| 10 | 53631087 |
| 11 | 374971549 |
| 12 | 2623479579 |
| 13 | 18351250984 |
| 14 | 128373536659 |
| 15 | 898014323096 |
| 16 | 6281872878413 |
| 17 | 43943675806740 |
| 18 | 307399346962192 |
| 19 | 2150352679484064 |
| 20 | 15042375439676549 |
[4,6,80,441,3249,22484,156293,1097881,7657324, 53631087,374971549,2623479579,18351250984, 128373536659,898014323096,6281872878413, 43943675806740,307399346962192,2150352679484064, 15042375439676549] |