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A221095 as a simple table

n a(n)
0 1
1 1
2 4
3 15
4 104
5 750
6 7254
7 74214
8 914528
9 12202632
10 183781080
11 2974435200
12 52965004872
13 1006137926040
14 20652503811744
15 449786292039000
16 10452618371303040
17 256326394027746240
18 6648055804021356864
19 181094856954089764032
20 5184169133931737988480

[1,1,4,15,104,750,7254,74214,914528,12202632,
 183781080,2974435200,52965004872,1006137926040,
 20652503811744,449786292039000,10452618371303040,
 256326394027746240,6648055804021356864,
 181094856954089764032,5184169133931737988480]

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Last modified July 6 23:04 EDT 2024. Contains 374060 sequences. (Running on oeis4.)