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A150185 as a simple table

n a(n)
0 1
1 2
2 6
3 20
4 80
5 304
6 1198
7 4880
8 20196
9 84392
10 356572
11 1520772
12 6530176
13 28222746
14 122757040
15 536408010
16 2353654246
17 10369862958
18 45853776044
19 203408616728
20 904980106270
21 4037154470484
22 18054334964388
23 80924856101506
24 363506260495212
25 1636056488860916
26 7376962377565698
27 33319803053180324

[1,2,6,20,80,304,1198,4880,20196,84392,356572,
 1520772,6530176,28222746,122757040,536408010,
 2353654246,10369862958,45853776044,203408616728,
 904980106270,4037154470484,18054334964388,
 80924856101506,363506260495212,1636056488860916,
 7376962377565698,33319803053180324]

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Last modified March 28 20:01 EDT 2020. Contains 333103 sequences. (Running on oeis4.)