# A376350 (b-file synthesized from sequence entry) 0 1 1 0 2 0 3 6 4 0 5 60 6 2520 7 1680 8 181440 9 6138720 10 18295200 11 1444988160 12 46443196800 13 357015859200 14 25016537145600 15 818965321574400 16 12259854032025600 17 815066633667686400 18 28461465853402982400 19 691667282863484928000 20 45198900807076912896000 21 1739192274792359202816000 22 60318174486002275287244800