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A189568 as a simple table

n a(n)
0 1
1 1
2 2
3 6
4 24
5 80
6 326
7 1566
8 9544
9 65036
10 518498
11 4750006
12 48830634
13 554929274
14 6926227324
15 93970452970
16 1377573324202 

[1,1,2,6,24,80,326,1566,9544,65036,518498,4750006,
 48830634,554929274,6926227324,93970452970,
 1377573324202]

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Last modified April 20 00:58 EDT 2024. Contains 371798 sequences. (Running on oeis4.)