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A149986 as a simple table

n a(n)
0 1
1 2
2 5
3 17
4 55
5 200
6 747
7 2886
8 11407
9 46180
10 188759
11 784953
12 3291063
13 13948318
14 59537085
15 256217269
16 1108406473
17 4826799850
18 21108279413
19 92791015661
20 409373685603
21 1813752099410
22 8060179508049
23 35947168744298
24 160730764771703
25 720860104401638
26 3240196703246163
27 14602369618879735

[1,2,5,17,55,200,747,2886,11407,46180,188759,
 784953,3291063,13948318,59537085,256217269,
 1108406473,4826799850,21108279413,92791015661,
 409373685603,1813752099410,8060179508049,
 35947168744298,160730764771703,720860104401638,
 3240196703246163,14602369618879735]

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Last modified January 20 08:07 EST 2020. Contains 331081 sequences. (Running on oeis4.)