# A091588 (b-file synthesized from sequence entry) 0 1 1 3 2 8 3 24 4 67 5 195 6 580 7 1730 8 5179 9 15533 10 46578 11 139712 12 419115 13 1257319 14 3771930 15 11315764 16 33947261 17 101841751 18 305525228 19 916575642 20 2749726883