# A000135 (b-file synthesized from sequence entry) 1 1 2 2 3 6 4 13 5 24 6 42 7 73 8 125 9 204 10 324 11 511 12 801 13 1228 14 1856 15 2780 16 4135 17 6084 18 8873 19 12847 20 18481 21 26416 22 37473 23 52871 24 74216 25 103596 26 143841 27 198839 28 273654 29 374987 30 511735 31 695559 32 941932 33 1271139 34 1709474 35 2291195 36 3061385 37 4078152 38 5416322