# A152116 (b-file synthesized from sequence entry) 0 1 1 1 2 1 3 4 4 15 5 45 6 160 7 533 8 1785 9 6052 10 20295 11 68441 12 230400 13 775657 14 2612233 15 8794980 16 29614935 17 99718277 18 335764960 19 1130580029 20 3806834625 21 12818225732 22 43161016271 23 145329992177 24 489349324800 25 1647717131025 26 5548126370513