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A180754 as a simple table

n a(n)
1 0
2 3
3 3
4 21
5 86
6 410
7 1874
8 8840
9 41755
10 197883
11 936625
12 4434387
13 20996674
14 99434998
15 470911050
16 2230166446
17 10561720749
18 50018822099
19 236882697591
20 1121846953883
21 5312927519916
22 25161362888858
23 119161085234850
24 564332106834338

[0,3,3,21,86,410,1874,8840,41755,197883,936625,
 4434387,20996674,99434998,470911050,2230166446,
 10561720749,50018822099,236882697591,
 1121846953883,5312927519916,25161362888858,
 119161085234850,564332106834338]

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Last modified February 1 03:56 EST 2023. Contains 359981 sequences. (Running on oeis4.)