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A218956
as a simple table
n
a(n)
0
1
1
1
2
1
3
1
4
7
5
31
6
101
7
491
8
3011
9
18467
10
114983
11
1283723
12
13380643
13
148321603
[1,1,1,1,7,31,101,491,3011,18467,114983,1283723, 13380643,148321603]