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A101223
as a simple table
n
a(n)
1
11
2
21
3
26
4
68
5
656
6
2336
7
8768
8
133376
9
528896
10
34360918016
11
35184409837568
12
576460757135261696
[11,21,26,68,656,2336,8768,133376,528896, 34360918016,35184409837568,576460757135261696]