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| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 1816 |
| 3 | 74528 |
| 4 | 1162292 |
| 5 | 10203222 |
| 6 | 61304844 |
| 7 | 281731072 |
| 8 | 1060924200 |
| 9 | 3426341574 |
| 10 | 9795159264 |
| 11 | 25359512992 |
| 12 | 60478538588 |
| 13 | 134596669142 |
| 14 | 282388072596 |
| 15 | 563045400576 |
| 16 | 1073890795600 |
| 17 | 1969791998214 |
| 18 | 3490220036904 |
| 19 | 5996191000608 |
[6,1816,74528,1162292,10203222,61304844,281731072, 1060924200,3426341574,9795159264,25359512992, 60478538588,134596669142,282388072596, 563045400576,1073890795600,1969791998214, 3490220036904,5996191000608] |