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A101805 as a simple table

n a(n)
1 2
2 4
3 7
4 20
5 57
6 149
7 523
8 1835
9 6810
10 26222
11 106670
12 444085

[2,4,7,20,57,149,523,1835,6810,26222,106670,
 444085]

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Last modified April 3 14:12 EDT 2020. Contains 333197 sequences. (Running on oeis4.)