# A052749 (b-file synthesized from sequence entry) 0 0 1 0 2 0 3 6 4 24 5 70 6 180 7 434 8 1008 9 2286 10 5100 11 11242 12 24552 13 53222 14 114660 15 245730 16 524256 17 1114078 18 2359260 19 4980698 20 10485720 21 22020054 22 46137300 23 96468946 24 201326544 25 419430350 26 872415180 27 1811939274 28 3758096328 29 7784628166 30 16106127300 31 33285996482