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A006717 as a simple table

n a(n)
0 1
1 3
2 15
3 133
4 2025
5 37851
6 1030367
7 36362925
8 1606008513
9 87656896891
10 5778121715415
11 452794797220965
12 41609568918940625 

[1,3,15,133,2025,37851,1030367,36362925,
 1606008513,87656896891,5778121715415,
 452794797220965,41609568918940625]

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Last modified April 24 04:02 EDT 2024. Contains 371918 sequences. (Running on oeis4.)