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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 6 |
| 3 | 42 |
| 4 | 546 |
| 5 | 9282 |
| 6 | 176358 |
| 7 | 4056234 |
| 8 | 117630786 |
| 9 | 4822862226 |
| 10 | 226674524622 |
| 11 | 13373796952698 |
| 12 | 1110025147073934 |
| 13 | 98792238089580126 |
| 14 | 9978016047047592726 |
| 15 | 1067647717034092421682 |
| 16 | 146267737233670661770434 |
[2,6,42,546,9282,176358,4056234,117630786, 4822862226,226674524622,13373796952698, 1110025147073934,98792238089580126, 9978016047047592726,1067647717034092421682, 146267737233670661770434] |