[0,1,3,7,19,55,159,471,1403,4199,12583,37735, 113187,339543,1018607,3055799,9167371,27502087, 82506231,247518663,742555955,2227667831, 6683003455,20049010327,60147030939,180441092775, 541323278279,1623969834791,4871909504323]