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A217890 as a simple table

n a(n)
1 1
2 3
3 11
4 45
5 197
6 903
7 4279
8 20792
9 103044
10 518864
11 2647244
12 13657284

[1,3,11,45,197,903,4279,20792,103044,518864,
 2647244,13657284]

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Last modified January 22 09:52 EST 2019. Contains 319363 sequences. (Running on oeis4.)