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A265882 as a simple table

n a(n)
1 1
2 0
3 2
4 0
5 2
6 6
7 0
8 2
9 24
10 24
11 0
12 2
13 152
14 792
15 120
16 0
17 2
18 894
19 30488
20 39360
21 720
22 0
23 2
24 5748
25 1584088
26 18437120
27 2396880
28 5040
29 0
30 2
31 38296
32 90246168
33 10856237680
34 13734486480
35 241012800
36 40320
37 0
38 2
39 263484
40 5533645144
41 7213744082208

[1,0,2,0,2,6,0,2,24,24,0,2,152,792,120,0,2,894,
 30488,39360,720,0,2,5748,1584088,18437120,2396880,
 5040,0,2,38296,90246168,10856237680,13734486480,
 241012800,40320,0,2,263484,5533645144,
 7213744082208]

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Last modified May 21 00:36 EDT 2022. Contains 353886 sequences. (Running on oeis4.)