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A261754
as a simple table
n
a(n)
1
2
2
4
3
0
4
11
5
0
6
31
7
0
8
0
9
0
10
0
11
0
12
1028
13
0
14
0
15
0
16
12251
17
0
18
43390
19
0
20
0
21
0
22
0
23
0
24
0
25
0
26
0
27
0
28
0
29
0
[2,4,0,11,0,31,0,0,0,0,0,1028,0,0,0,12251,0,43390, 0,0,0,0,0,0,0,0,0,0,0]