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A323922 as a simple table

n a(n)
1 0
2 0
3 0
4 1
5 5
6 23
7 98
8 393
9 1600
10 6486
11 26694
12 110818
13 465890
14 1978032
15 8481860
16 36681383
17 159894915
18 701898184
19 3100972840
20 13779678410
21 61557361263
22 276326335318
23 1245934013926
24 5640863040825
25 25635343582986

[0,0,0,1,5,23,98,393,1600,6486,26694,110818,
 465890,1978032,8481860,36681383,159894915,
 701898184,3100972840,13779678410,61557361263,
 276326335318,1245934013926,5640863040825,
 25635343582986]

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Last modified December 3 05:05 EST 2021. Contains 349445 sequences. (Running on oeis4.)