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A292884
as a simple table
n
a(n)
1
1
2
3
3
8
4
25
5
76
6
248
7
806
8
2714
9
9205
10
31846
11
111185
12
393224
[1,3,8,25,76,248,806,2714,9205,31846,111185, 393224]