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A273205 as a simple table

na(n)
01
15
221
381
4297
51037
64417
717413
867973
9267397
101059461
114216453
1216821893
1367198597
14268615301
151074101893

[1,5,21,81,297,1037,4417,17413,67973,267397,
 1059461,4216453,16821893,67198597,268615301,
 1074101893]