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A075581 as a simple table

n a(n)
0 1
1 4
2 16
3 80
4 448
5 2304
6 11520
7 67584
8 372736
9 1966080
10 11141120
11 63504384
12 348651520
13 1917583360
14 11142168576
15 62704844800
16 343513497600
17 1992378286080
18 11402534191104
19 63709397385216
20 361019918516224

[1,4,16,80,448,2304,11520,67584,372736,1966080,
 11141120,63504384,348651520,1917583360,
 11142168576,62704844800,343513497600,
 1992378286080,11402534191104,63709397385216,
 361019918516224]

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Last modified April 25 08:27 EDT 2024. Contains 371964 sequences. (Running on oeis4.)