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A108235
as a simple table
n
a(n)
0
1
1
1
2
0
3
0
4
8
5
21
6
0
7
0
8
3040
9
20505
10
0
11
0
12
10567748
13
103372655
14
0
15
0
16
142664107305
17
1836652173363
18
0
19
0
[1,1,0,0,8,21,0,0,3040,20505,0,0,10567748, 103372655,0,0,142664107305,1836652173363,0,0]