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A235455
as a simple table
n
a(n)
2
1
3
15
4
181
5
1253
6
6044
7
22302
8
68661
9
183645
10
439578
11
964938
12
1974128
13
3801457
14
6966581
[1,15,181,1253,6044,22302,68661,183645,439578, 964938,1974128,3801457,6966581]