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A289971 as a simple table

n a(n)
0 1
1 1
2 2
3 4
4 9
5 20
6 49
7 114
8 277
9 665
10 1608
11 3875

[1,1,2,4,9,20,49,114,277,665,1608,3875]

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Last modified February 18 05:48 EST 2018. Contains 299298 sequences. (Running on oeis4.)