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A055891 as a simple table

n a(n)
0 1
1 2
2 7
3 20
4 64
5 200
6 686
7 2324
8 8194
9 29084
10 104860
11 381116
12 1398148
13 5161592
14 19173958
15 71580752
16 268435474
17 1010572832
18 3817749138
19 14467230668
20 54975581488
21 209430687944
22 799644820114
23 3059510251700
24 11728124035248

[1,2,7,20,64,200,686,2324,8194,29084,104860,
 381116,1398148,5161592,19173958,71580752,
 268435474,1010572832,3817749138,14467230668,
 54975581488,209430687944,799644820114,
 3059510251700,11728124035248]

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Last modified February 23 05:58 EST 2019. Contains 320411 sequences. (Running on oeis4.)