# A139331 (b-file synthesized from sequence entry) 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 2 8 2 9 1 10 1 11 6 12 12 13 6 14 1 15 1 16 12 17 72 18 72 19 12 20 1 21 1 22 20 23 240 24 720 25 240 26 20 27 1 28 1 29 30 30 600 31 3600 32 3600 33 600 34 30 35 1 36 1 37 56 38 1680 39 16800 40 33600 41 16800 42 1680 43 56 44 1 45 1 46 72 47 4032 48 60480 49 201600 50 201600 51 60480 52 4032 53 72 54 1