[0,1,3,7,19,53,153,455,1359,4073,12213,36635, 109899,329693,989073,2967215,8901639,26704913, 80114733,240344195,721032579,2163097733, 6489293193,19467879575,58403638719,175210916153, 525632748453,1576898245355,4730694736059]