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A051681 as a simple table

n a(n)
1 4
2 8
3 48
4 242
5 844
6 22020
7 217070
8 1092747
9 8870024
10 262315467
11 221167422
12 47255689915
13 82462576220
14 1043460553364
15 79180770078548
16 3215226335143218
17 23742453640900972
18 125781000834058568

[4,8,48,242,844,22020,217070,1092747,8870024,
 262315467,221167422,47255689915,82462576220,
 1043460553364,79180770078548,3215226335143218,
 23742453640900972,125781000834058568]

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Last modified May 27 10:03 EDT 2017. Contains 287204 sequences.