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A297871 as a simple table

n a(n)
1 0
2 3
3 0
4 3
5 0
6 3
7 6
8 23
9 68
10 205
11 572
12 1553
13 4208
14 11405
15 30988
16 84553
17 231176
18 632915
19 1734004
20 4751591
21 13021550
22 35685855
23 97797264
24 268015939
25 734511376
26 2012982445
27 5516772882
28 15119337301
29 41436399090
30 113561805901
31 311231201784

[0,3,0,3,0,3,6,23,68,205,572,1553,4208,11405,
 30988,84553,231176,632915,1734004,4751591,
 13021550,35685855,97797264,268015939,734511376,
 2012982445,5516772882,15119337301,41436399090,
 113561805901,311231201784]

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Last modified June 12 14:32 EDT 2021. Contains 344957 sequences. (Running on oeis4.)