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A273389 as a simple table

na(n)
01
15
221
381
4297
51201
65037
720365
881741
9327373
101310157
115241805
1220969421
1383881933
14335536077
151342160845

[1,5,21,81,297,1201,5037,20365,81741,327373,
 1310157,5241805,20969421,83881933,335536077,
 1342160845]