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A226421
as a simple table
n
a(n)
1
2
2
62
3
431
4
2394
5
9546
6
35451
7
108478
8
302135
9
777184
10
1900407
11
4327920
12
9528141
13
19739530
[2,62,431,2394,9546,35451,108478,302135,777184, 1900407,4327920,9528141,19739530]