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A006717 as a simple table

na(n)
01
13
215
3133
42025
537851
61030367
736362925
81606008513
987656896891
105778121715415
11452794797220965
1241609568918940625

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