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A149426 as a simple table

n a(n)
0 1
1 1
2 4
3 13
4 43
5 165
6 653
7 2554
8 10353
9 43406
10 181669
11 766756
12 3300981
13 14302542
14 62073273
15 272025803
16 1201510207
17 5316833661
18 23625660731
19 105633697288
20 473708034708
21 2128697603138
22 9603529706857
23 43467271246910
24 197075677833424
25 895605279361840
26 4081386577467745
27 18632961639799468

[1,1,4,13,43,165,653,2554,10353,43406,181669,
 766756,3300981,14302542,62073273,272025803,
 1201510207,5316833661,23625660731,105633697288,
 473708034708,2128697603138,9603529706857,
 43467271246910,197075677833424,895605279361840,
 4081386577467745,18632961639799468]

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Last modified December 6 16:26 EST 2021. Contains 349567 sequences. (Running on oeis4.)