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A270291 as a simple table

na(n)
01
15
237
3177
4785
53345
614113
757697
8231809
9932161
103730689
1114942145
1259816609
13239315361
14957265025
153829309985

[1,5,37,177,785,3345,14113,57697,231809,932161,
 3730689,14942145,59816609,239315361,957265025,
 3829309985]