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A149413 as a simple table

n a(n)
0 1
1 1
2 4
3 12
4 53
5 177
6 828
7 3092
8 14784
9 57789
10 280272
11 1135447
12 5552568
13 23024141
14 113220356
15 477899480
16 2359089266
17 10094151186
18 49965552101
19 216128476308
20 1071992173208
21 4678195921440
22 23239176677578
23 102166556126257
24 508113249104213
25 2247796432093211
26 11189390004754332
27 49765229004840975

[1,1,4,12,53,177,828,3092,14784,57789,280272,
 1135447,5552568,23024141,113220356,477899480,
 2359089266,10094151186,49965552101,216128476308,
 1071992173208,4678195921440,23239176677578,
 102166556126257,508113249104213,2247796432093211,
 11189390004754332,49765229004840975]

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Last modified December 3 21:17 EST 2021. Contains 349468 sequences. (Running on oeis4.)