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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]