[1,2,6,18,55,174,570,1908,6473,22202,76886,268352, 942651,3329608,11817582,42120340,150682450, 540832274,1946892842,7027047848,25424079339, 92185846608,334925007128,1219054432490, 4444545298879,16229462702152,59347661054364]