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A331237 as a simple table

n a(n)
1 0
2 0
3 1
4 5
5 15
6 47
7 127
8 363
9 978
10 2778
11 7624
12 21566
13 60584
14 172221
15 488978
16 1398457
17 4001323
18 11490717
19 33037548
20 95195793
21 274609124
22 793298293
23 2294114542
24 6641070332
25 19241453969
26 55795142707
27 161910611244

[0,0,1,5,15,47,127,363,978,2778,7624,21566,60584,
 172221,488978,1398457,4001323,11490717,33037548,
 95195793,274609124,793298293,2294114542,
 6641070332,19241453969,55795142707,161910611244]

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Last modified January 23 14:36 EST 2021. Contains 340385 sequences. (Running on oeis4.)