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A020755 as a simple table

n a(n)
1 2
2 5
3 10
4 51
5 246
6 849
7 22026
8 217077
9 1092755
10 8870033
11 221167433
12 47255689927
13 82462576233
14 1043460553378
15 79180770078563
16 3215226335143234
17 23742453640900989
18 125781000834058586

[2,5,10,51,246,849,22026,217077,1092755,8870033,
 221167433,47255689927,82462576233,1043460553378,
 79180770078563,3215226335143234,23742453640900989,
 125781000834058586]

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Last modified May 28 15:33 EDT 2020. Contains 334684 sequences. (Running on oeis4.)