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A171877 as a simple table

n a(n)
0 0
1 0
2 1
3 1
4 1
5 3
6 5
7 9
8 25
9 73
10 423
11 61297
12 3814697357801
13 38288777744833624093154249190851262684887027625

[0,0,1,1,1,3,5,9,25,73,423,61297,3814697357801,
 38288777744833624093154249190851262684887027625]

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Last modified February 21 04:18 EST 2019. Contains 320371 sequences. (Running on oeis4.)