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A147055 as a simple table

na(n)
11
21
31
41
51
61
71
83
99
1019
1133
1255
13157
14613
152645
1610617
1738367
18155201
19818161
205194409
2136087637
22257389985

[1,1,1,1,1,1,1,3,9,19,33,55,157,613,2645,10617,
 38367,155201,818161,5194409,36087637,257389985]