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A081978 as a simple table

n a(n)
1 1
2 3
3 0
4 6
5 0
6 28
7 0
8 66
9 36
10 496
11 0
12 276
13 0
14 8128
15 1631432881
16 120
17 0
18 300
19 0
20 528

[1,3,0,6,0,28,0,66,36,496,0,276,0,8128,1631432881,
 120,0,300,0,528]

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Last modified November 20 14:54 EST 2019. Contains 329337 sequences. (Running on oeis4.)