[1,1,4,8,22,52,132,324,808,2000,4968,12320,30576, 75856,188224,467008,1158752,2875072,7133632, 17699904,43916928,108966400,270366848,670832640, 1664466176,4129863936,10246994944,25424785408, 63083832832]