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A177540 as a simple table

n a(n)
0 1
1 1
2 2
3 6
4 24
5 120
6 720
7 4908
8 38208
9 334368
10 3248640
11 34774112
12 405758208
13 5129918808
14 69849531936
15 1018876044528
16 15854497560576
17 262116761475488
18 4588408779868800
19 84784281517177940
20 1649073291620014880
21 33678805727832427224
22 720569710852319474016

[1,1,2,6,24,120,720,4908,38208,334368,3248640,
 34774112,405758208,5129918808,69849531936,
 1018876044528,15854497560576,262116761475488,
 4588408779868800,84784281517177940,
 1649073291620014880,33678805727832427224,
 720569710852319474016]

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Last modified May 14 05:12 EDT 2024. Contains 372528 sequences. (Running on oeis4.)