# A251701 (b-file synthesized from sequence entry) 0 1 1 4 2 13 3 36 4 97 5 268 6 765 7 2236 8 6625 9 19764 10 59149 11 177268 12 531585 13 1594492 14 4783165 15 14349132 16 43046977 17 129140452 18 387420813 19 1162261828 20 3486784801 21 10460353644 22 31381060093 23 94143179356 24 282429537057 25 847288610068 26 2541865829005 27 7625597485716