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A089387 as a simple table

n a(n)
0 1
1 1
2 2
3 8
4 36
5 164
6 764
7 3652
8 17852
9 88868
10 449004
11 2296692
12 11870316
13 61897140
14 325239036
15 1720415268
16 9154052700
17 48961321604
18 263092909004
19 1419630359572
20 7689097400588
21 41788586179988
22 227819374037340
23 1245545102522948

[1,1,2,8,36,164,764,3652,17852,88868,449004,
 2296692,11870316,61897140,325239036,1720415268,
 9154052700,48961321604,263092909004,1419630359572,
 7689097400588,41788586179988,227819374037340,
 1245545102522948]

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Last modified April 25 13:32 EDT 2024. Contains 371971 sequences. (Running on oeis4.)