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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 4 |
| 3 | 1016 |
| 4 | 547856 |
| 5 | 813732832 |
| 6 | 3903659417664 |
| 7 | 67987041960443776 |
| 8 | 4575641535535493153024 |
| 9 | 1216334976081196096854162944 |
| 10 | 1285452910821757852273429343896576 |
| 11 | 5415346123378152397099190627515485911040 |
| 12 | 91076602434014222291049466570765323207327092736 |
[0,4,1016,547856,813732832,3903659417664, 67987041960443776,4575641535535493153024, 1216334976081196096854162944, 1285452910821757852273429343896576, 5415346123378152397099190627515485911040, 91076602434014222291049466570765323207327092736] |