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A012824 as a simple table

n a(n)
0 1
1 4
2 80
3 3176
4 240128
5 26523264
6 4329123968
7 926411177472
8 262606340440064
9 92031599216406528
10 40177149524079247360
11 20888461815920151461888
12 13005071730835628127846400
13 9394925108531366128729587712

[1,4,80,3176,240128,26523264,4329123968,
 926411177472,262606340440064,92031599216406528,
 40177149524079247360,20888461815920151461888,
 13005071730835628127846400,
 9394925108531366128729587712]

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Last modified August 10 20:21 EDT 2022. Contains 356039 sequences. (Running on oeis4.)