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A155581 as a simple table

n a(n)
0 1
1 1
2 2
3 7
4 28
5 84
6 384
7 1824
8 6080
9 30400
10 304000
11 1064000
12 12768000
13 67488000
14 359936000
15 1934656000
16 30954496000
17 526226432000
18 2880397312000
19 15842185216000
20 316843704320000
21 1757042360320000
22 38654931927040000

[1,1,2,7,28,84,384,1824,6080,30400,304000,1064000,
 12768000,67488000,359936000,1934656000,
 30954496000,526226432000,2880397312000,
 15842185216000,316843704320000,1757042360320000,
 38654931927040000]

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Last modified September 18 18:09 EDT 2024. Contains 376002 sequences. (Running on oeis4.)