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A218960
as a simple table
n
a(n)
0
1
1
1
2
1
3
1
4
1
5
21
6
76
7
456
8
996
9
12136
10
80836
11
807676
12
8779816
13
104127596
[1,1,1,1,1,21,76,456,996,12136,80836,807676, 8779816,104127596]