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A179505 as a simple table

n a(n)
0 1
1 1
2 2
3 9
4 56
5 480
6 4374
7 47894
8 574888
9 7829424
10 116392080
11 1901059512
12 33564909432
13 639562529424
14 13047133134840
15 283976169754440
16 6563364026374464
17 160538113862231808
18 4141949353327046592
19 112396373034208003008
20 3199752121483607518080

[1,1,2,9,56,480,4374,47894,574888,7829424,
 116392080,1901059512,33564909432,639562529424,
 13047133134840,283976169754440,6563364026374464,
 160538113862231808,4141949353327046592,
 112396373034208003008,3199752121483607518080]

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Last modified August 8 08:24 EDT 2020. Contains 336293 sequences. (Running on oeis4.)