# A111492 (b-file synthesized from sequence entry) 1 1 2 2 3 1 4 3 5 3 6 2 7 4 8 6 9 8 10 6 11 5 12 10 13 20 14 30 15 24 16 6 17 15 18 40 19 90 20 144 21 120 22 7 23 21 24 70 25 210 26 504 27 840 28 720 29 8 30 28 31 112 32 420 33 1344 34 3360 35 5760 36 5040 37 9 38 36 39 168 40 756 41 3024 42 10080 43 25920 44 45360 45 40320 46 10 47 45 48 240 49 1260 50 6048 51 25200 52 86400 53 226800 54 403200 55 362880