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A099468 as a simple table

na(n)
11
221
345
451
581
6213
7249
8315
9477
10525
11681
12891
131143
141221
151851
161965
172415
185133

[1,21,45,51,81,213,249,315,477,525,681,891,1143,
 1221,1851,1965,2415,5133]