[0,0,0,1,2,4,9,18,36,73,146,292,585,1170,2340,4681,9362,18724,37449,74898,149796,299593,599186,1198372,2396745,4793490,9586980,19173961,38347922,76695844,153391689,306783378,613566756,1227133513,2454267026,4908534052]
