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A317577 as a simple table

n a(n)
1 0
2 0
3 0
4 0
5 6
6 6
7 0
8 18
9 54
10 0
11 258
12 612
13 0
14 3570
15 8880
16 0
17 55764
18 142368
19 0
20 947946
21 2468844
22 0
23 17099808
24 45375498
25 0
26 323927184
27 871038570
28 0
29 6369199908
30 17312303760

[0,0,0,0,6,6,0,18,54,0,258,612,0,3570,8880,0,
 55764,142368,0,947946,2468844,0,17099808,45375498,
 0,323927184,871038570,0,6369199908,17312303760]

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Last modified October 22 22:35 EDT 2021. Contains 348180 sequences. (Running on oeis4.)