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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 12 |
| 3 | 1120 |
| 4 | 50450400 |
| 5 | 1387660381886338560 |
| 6 | 58833957894412548628347941194431580569600 |
| 7 | 54468560860672704568758301042326371229883670125439070950586847311164532855256159027200000 |
[1,2,12,1120,50450400,1387660381886338560, 58833957894412548628347941194431580569600, 54468560860672704568758301042326371229883670125439\ 070950586847311164532855256159027200000] |