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A326755 as a simple table

n a(n)
0 1
1 0
2 1
3 0
4 6
5 24
6 90
7 504
8 7560
9 18144
10 485352
11 4626720
12 32033232
13 516559680
14 9142044912
15 64700161344
16 1804378343040
17 29722011830784
18 308081755013760
19 8202581858225664
20 184073277074529024
21 2067986628774743040
22 75069447974837132544
23 1673053361596502645760

[1,0,1,0,6,24,90,504,7560,18144,485352,4626720,
 32033232,516559680,9142044912,64700161344,
 1804378343040,29722011830784,308081755013760,
 8202581858225664,184073277074529024,
 2067986628774743040,75069447974837132544,
 1673053361596502645760]

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Last modified June 10 07:13 EDT 2024. Contains 373253 sequences. (Running on oeis4.)