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A187010 as a simple table

n a(n)
0 1
1 1
2 1
3 4
4 8
5 20
6 65
7 189
8 545
9 1672
10 5234
11 16483
12 52508
13 168948
14 547031
15 1782892
16 5851234
17 19308826
18 64012154
19 213130527
20 712361672
21 2389177656
22 8038552120
23 27125159211
24 91774118484
25 311265968741
26 1058099992873
27 3604394906225

[1,1,1,4,8,20,65,189,545,1672,5234,16483,52508,
 168948,547031,1782892,5851234,19308826,64012154,
 213130527,712361672,2389177656,8038552120,
 27125159211,91774118484,311265968741,
 1058099992873,3604394906225]

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Last modified January 26 19:45 EST 2021. Contains 340442 sequences. (Running on oeis4.)