# A049612 (b-file synthesized from sequence entry) 0 0 1 1 2 5 3 19 4 63 5 192 6 552 7 1520 8 4048 9 10496 10 26624 11 66304 12 162560 13 393216 14 940032 15 2224128 16 5214208 17 12124160 18 27983872 19 64159744 20 146210816 21 331350016 22 747110400 23 1676673024 24 3746562048 25 8338276352 26 18488492032