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A114245
as a simple table
n
a(n)
1
0
2
1
3
6
4
23
5
78
6
246
7
760
8
2155
9
5804
10
15472
11
39871
12
102839
13
264461
[0,1,6,23,78,246,760,2155,5804,15472,39871,102839, 264461]