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A089097 as a simple table

n a(n)
1 0
2 1
3 6
4 33
5 141
6 552
7 1946
8 6435
9 20001
10 59345
11 168760
12 463385
13 1232823
14 3191530
15 8061092
16 19919613
17 48254154
18 114812555
19 268726954
20 619603435
21 1409005702
22 3163562545
23 7019574578
24 15405769535
25 33467185837
26 72013318602
27 153577775602

[0,1,6,33,141,552,1946,6435,20001,59345,168760,
 463385,1232823,3191530,8061092,19919613,48254154,
 114812555,268726954,619603435,1409005702,
 3163562545,7019574578,15405769535,33467185837,
 72013318602,153577775602]

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Last modified September 27 12:30 EDT 2020. Contains 337380 sequences. (Running on oeis4.)