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A331715
as a simple table
n
a(n)
1
1
2
11
3
66
4
278
5
966
6
2957
7
8149
8
20676
9
48911
10
108942
11
230201
12
464528
13
899633
14
1679685
15
3034620
[1,11,66,278,966,2957,8149,20676,48911,108942, 230201,464528,899633,1679685,3034620]