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A309159 as a simple table

n a(n)
0 1
1 2
2 2
3 4
4 10
5 28
6 79
7 235
8 720
9 2254
10 7146
11 22927
12 74137
13 241461
14 790838
15 2603210
16 8604861
17 28549166
18 95027832
19 317229779
20 1061764660
21 3562113987
22 11976146355

[1,2,2,4,10,28,79,235,720,2254,7146,22927,74137,
 241461,790838,2603210,8604861,28549166,95027832,
 317229779,1061764660,3562113987,11976146355]

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Last modified January 18 16:27 EST 2020. Contains 331011 sequences. (Running on oeis4.)