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A198313
as a simple table
n
a(n)
0
0
1
0
2
0
3
1
4
1
5
1
6
4
7
4
8
15
9
23
10
162
11
540
12
18958
13
389417
14
50314520
15
2942196930
16
1698517018988
[0,0,0,1,1,1,4,4,15,23,162,540,18958,389417, 50314520,2942196930,1698517018988]
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Last modified August 31 22:14 EDT 2024. Contains 375574 sequences. (Running on oeis4.)