1,1,1,2,2,3,4,5,7,9,12,16,21,28……数列

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1,1,1,2,2,3,4,5,7,9,12,16,21,28……数列1,1,1,2,2,3,4,5,7,9,12,16,21,28……数列1,1,1,2,2,3,4,5,7,9,12,16,21,2

1,1,1,2,2,3,4,5,7,9,12,16,21,28……数列
1,1,1,2,2,3,4,5,7,9,12,16,21,28……数列

1,1,1,2,2,3,4,5,7,9,12,16,21,28……数列
通项公式为
An=A(n-2)+A(n-3) 其中n>3
A1=1,A2=1,A3=1