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A111868 as a simple table

n a(n)
1 0
2 4
3 72
4 1280
5 25000
6 544320
7 13176688
8 352321536
9 10331213040
10 330000000000
11 11412466824440
12 425000788033536
13 16961005969166168
14 722280443661271040
15 32696077148437500000
16 1567973246265311887360
17 79415065141088329360992
18 4236296602773593878953984

[0,4,72,1280,25000,544320,13176688,352321536,
 10331213040,330000000000,11412466824440,
 425000788033536,16961005969166168,
 722280443661271040,32696077148437500000,
 1567973246265311887360,79415065141088329360992,
 4236296602773593878953984]

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Last modified May 12 14:31 EDT 2024. Contains 372481 sequences. (Running on oeis4.)