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A232664
as a simple table
n
a(n)
1
1
2
1
3
2
4
4
5
16
6
56
7
408
8
2376
9
19920
10
156096
11
1711680
12
16851072
13
216434304
14
2557907712
15
38102969088
[1,1,2,4,16,56,408,2376,19920,156096,1711680, 16851072,216434304,2557907712,38102969088]
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Last modified April 25 06:14 EDT 2024. Contains 371964 sequences. (Running on oeis4.)