# A166880 (b-file synthesized from sequence entry) 0 1 1 1 2 1 3 1 4 1 5 2 6 4 7 6 8 8 9 8 10 6 11 3 12 1 13 1 14 3 15 9 16 24 17 60 18 138 19 294 20 579 21 1053 22 1767 23 2739 24 3924 25 5196 26 6352 27 7152 28 7389 29 6969 30 5961 31 4587 32 3144 33 1896 34 990 35 438 36 159 37 45 38 9 39 1 40 1 41 4 42 16 43 60 44 216 45 744 46 2460 47 7818 48 23910 49 70446 50 200160 51 549006 52 1455132 53 3730846 54 9262712