# A123900 (b-file synthesized from sequence entry) 0 6 1 12 2 60 3 180 4 2520 5 1008 6 18144 7 18144 8 3991680 9 5987520 10 155675520 11 1089728640 12 26153487360 13 523069747200 14 17784371404800 15 12312257126400 16 935731541606400 17 4678657708032 18 12772735542927360 19 140500090972200960