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A072507
as a simple table
n
a(n)
1
1
2
2
3
0
4
0
5
0
6
0
7
0
8
0
9
0
10
0
11
0
12
120402988681658048433948
13
0
14
0
15
0
16
0
17
0
18
0
19
0
20
0
21
0
22
0
23
0
[1,2,0,0,0,0,0,0,0,0,0,120402988681658048433948,0, 0,0,0,0,0,0,0,0,0,0]