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A273836 as a simple table

na(n)
01
15
217
361
4277
51061
64241
718749
877869
9327061
101355757
115533821
1222419573
1390547821
14363913981
151459594693

[1,5,17,61,277,1061,4241,18749,77869,327061,
 1355757,5533821,22419573,90547821,363913981,
 1459594693]