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A111966 as a simple table

n a(n)
0 1
1 4
2 18
3 86
4 424
5 2128
6 10798
7 55190
8 283510
9 1461730
10 7557166
11 39153338
12 203188892
13 1055863564
14 5492668906
15 28598497610
16 149012237696
17 776904940576
18 4052654604042
19 21149661562298
20 110415949871240
21 576636302495488

[1,4,18,86,424,2128,10798,55190,283510,1461730,
 7557166,39153338,203188892,1055863564,5492668906,
 28598497610,149012237696,776904940576,
 4052654604042,21149661562298,110415949871240,
 576636302495488]

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Last modified July 11 20:03 EDT 2020. Contains 335652 sequences. (Running on oeis4.)