# A174836 (b-file synthesized from sequence entry) 0 1 1 4 2 16 3 46 4 124 5 310 6 748 7 1750 8 4012 9 9046 10 20140 11 44374 12 96940 13 210262 14 453292 15 972118 16 2075308 17 4412758 18 9349804 19 19748182 20 41593516 21 87381334 22 183151276 23 383079766 24 799713964 25 1666536790 26 3467291308 27 7203018070 28 14942907052 29 30959555926 30 64066595500 31 132428158294