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A179496 as a simple table

n a(n)
0 1
1 1
2 4
3 21
4 164
5 1590
6 18984
7 266154
8 4306672
9 78850080
10 1612769040
11 36436534200
12 901265930784
13 24223557739056
14 702975780428544
15 21907246213656720
16 729670520457987840
17 25867686811627795200
18 972505009580975483904

[1,1,4,21,164,1590,18984,266154,4306672,78850080,
 1612769040,36436534200,901265930784,
 24223557739056,702975780428544,21907246213656720,
 729670520457987840,25867686811627795200,
 972505009580975483904]

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Last modified December 3 00:23 EST 2022. Contains 358510 sequences. (Running on oeis4.)