应该是 1,1,2,3,5,8,13,21,34,55,89,144,233.
a[1]=1 a[2]=1 a[3]=2 ...
a[n+2] = a[n+1] + a[n]; (n=1,2,3,4 ...)
此级数是发散的,当n充分大时 a[n]没有上界...