[0,1,4,16,64,260,1072,4480,18944,80928,348800, 1515008,6625280,29147456,128918272,572928000, 2557100032,11457170944,51514963968,232370167808, 1051235287040,4768568354816,21684663148544, 98835356778496,451433970008064]