A087925 Number of ways of arranging the numbers 1 ... 4n into a 4 X n array so there is exactly one local maximum.
8, 3584, 7452704, 35704394880, 331333877743200, 5338455334819710720, 137813651152462288749440, 5359457796069778002771306240, 299167849199075018703047460201600
Offset: 1