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A180389 as a simple table

n a(n)
0 1
1 1
2 2
3 6
4 22
5 96
6 492
7 2952
8 20588
9 164990
10 1497740
11 15187692
12 169974040
13 2078905752
14 27567259896
15 393759207372
16 6025346314756
17 98317949671110
18 1703879074519500
19 31251488731748108
20 604748393942784976
21 12312387380060084768
22 263079571362773145632

[1,1,2,6,22,96,492,2952,20588,164990,1497740,
 15187692,169974040,2078905752,27567259896,
 393759207372,6025346314756,98317949671110,
 1703879074519500,31251488731748108,
 604748393942784976,12312387380060084768,
 263079571362773145632]

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Last modified April 23 20:27 EDT 2024. Contains 371916 sequences. (Running on oeis4.)