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A015535 as a simple table

n a(n)
0 0
1 1
2 5
3 27
4 145
5 779
6 4185
7 22483
8 120785
9 648891
10 3486025
11 18727907
12 100611585
13 540513739
14 2903791865
15 15599986803
16 83807517745
17 450237562331
18 2418802847145
19 12994489360387
20 69810052496225
21 375039241201899
22 2014816311001945
23 10824160037413523

[0,1,5,27,145,779,4185,22483,120785,648891,
 3486025,18727907,100611585,540513739,2903791865,
 15599986803,83807517745,450237562331,
 2418802847145,12994489360387,69810052496225,
 375039241201899,2014816311001945,
 10824160037413523]

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Last modified June 4 08:18 EDT 2020. Contains 334825 sequences. (Running on oeis4.)