# A218305 (b-file synthesized from sequence entry) 0 1 1 1 2 8 3 148 4 4256 5 166816 6 8297600 7 500730112 8 35547379712 9 2902899914752 10 268094176428032 11 27629598827044864 12 3143573312615481344 13 391375817676973932544 14 52926434374336385122304 15 7725597721066205089890304 16 1210677595048894480252928000