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A014372
as a simple table
n
a(n)
0
1
1
0
2
0
3
0
4
0
5
1
6
2
7
9
8
49
9
455
10
5783
11
90938
12
1620479
13
31478584
14
656783890
15
14621871204
16
345975648562
[1,0,0,0,0,1,2,9,49,455,5783,90938,1620479, 31478584,656783890,14621871204,345975648562]