# A218427 (b-file synthesized from sequence entry) 1 10 2 60 3 1170 4 114660 5 72602880 6 668304000 7 714954240 8 1307124000 9 1381161600 10 2701389600 11 8052817920 12 10181689600 13 643773312000 14 1330464844800 15 2015156183040 16 3522876144480 17 15462510336000 18 23885971200000 19 702577007193600 20 908714417345280