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A180170 as a simple table

n a(n)
0 1
1 1
2 4
3 36
4 288
5 7200
6 43200
7 2116800
8 33868800
9 914457600
10 9144576000
11 1106493696000
12 13277924352000
13 2243969215488000
14 31415569016832000
15 471233535252480000
16 15079473128079360000
17 4357967734014935040000
18 78443419212268830720000

[1,1,4,36,288,7200,43200,2116800,33868800,
 914457600,9144576000,1106493696000,13277924352000,
 2243969215488000,31415569016832000,
 471233535252480000,15079473128079360000,
 4357967734014935040000,78443419212268830720000]

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Last modified October 16 01:20 EDT 2019. Contains 328038 sequences. (Running on oeis4.)