# A327630 (b-file synthesized from sequence entry) 1 1 2 2 3 6 4 6 5 24 6 24 7 24 8 60 9 120 10 480 11 540 12 1560 13 2520 14 10920 15 27720 16 30240 17 191520 18 360360 19 360360 20 3243240 21 5765760 22 28828800 23 109549440 24 438197760 25 766846080 26 3834230400 27 9081072000 28 32974381440 29 147516969600 30 880887047040 31 2802822422400