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A152014
as a simple table
n
a(n)
1
0
2
8
3
28
4
204
5
1406
6
9538
7
70474
8
535578
9
4192024
10
33619380
11
274890230
12
2294771254
[0,8,28,204,1406,9538,70474,535578,4192024, 33619380,274890230,2294771254]