# A072479 (b-file synthesized from sequence entry) 0 1 1 1 2 1 3 1 4 1 5 3 6 1 7 15 8 3 9 105 10 12 11 945 12 60 13 10395 14 360 15 135135 16 2520 17 2027025 18 20160 19 34459425 20 181440 21 654729075 22 1814400 23 13749310575 24 19958400 25 316234143225 26 239500800 27 7905853580625 28 3113510400 29 213458046676875 30 43589145600