# A181897 (b-file synthesized from sequence entry) 1 1 2 1 3 1 4 1 5 3 6 2 7 1 8 6 9 8 10 3 11 6 12 1 13 10 14 20 15 15 16 30 17 20 18 24 19 1 20 15 21 40 22 45 23 90 24 120 25 144 26 15 27 90 28 40 29 120 30 1 31 21 32 70 33 105 34 210 35 420 36 504 37 105 38 630 39 280 40 840 41 210 42 504 43 420 44 720 45 1 46 28 47 112 48 210 49 420 50 1120 51 1344 52 420 53 2520 54 1120 55 3360 56 1680 57 4032