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A280624 as a simple table

n a(n)
0 1
1 1
2 2
3 5
4 20
5 81
6 452
7 2765
8 19460
9 156121
10 1368052
11 13327125
12 141326500
13 1616350561
14 20040895252
15 264759181085
16 3740415315140
17 56164918735401
18 891038080096052
19 14957788277468645
20 263869908657105380
21 4889789934063374641
22 94981373343123194452
23 1926808692484086173805
24 40825113073569433353220
25 900600514588651088444281

[1,1,2,5,20,81,452,2765,19460,156121,1368052,
 13327125,141326500,1616350561,20040895252,
 264759181085,3740415315140,56164918735401,
 891038080096052,14957788277468645,
 263869908657105380,4889789934063374641,
 94981373343123194452,1926808692484086173805,
 40825113073569433353220,900600514588651088444281]

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Last modified January 20 10:31 EST 2022. Contains 350471 sequences. (Running on oeis4.)