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A180266 as a simple table

n a(n)
0 0
1 1
2 2
3 10
4 50
5 238
6 1092
7 4884
8 21450
9 92950
10 398684
11 1696396
12 7171892
13 30161740
14 126293000
15 526864680
16 2191034970
17 9086921190
18 37596989100
19 155232577500
20 639749274780
21 2632212288420
22 10814090022840
23 44369043365400

[0,1,2,10,50,238,1092,4884,21450,92950,398684,
 1696396,7171892,30161740,126293000,526864680,
 2191034970,9086921190,37596989100,155232577500,
 639749274780,2632212288420,10814090022840,
 44369043365400]

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Last modified May 11 11:54 EDT 2021. Contains 343791 sequences. (Running on oeis4.)