[1,0,4,8,18,72,162,520,1514,4312,13242,39088,118586,361712,1103946,3403624,10513130,32614696,101530170,316770752,990771834,3104283168,9741133578,30606719000,96263812906,303028237848,954563802106,3008665176560,9487377712634,29928407213328]
