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A147031 as a simple table

na(n)
11
21
31
41
51
61
71
81
95
1013
1125
1243
1389
14283
151197
165015
1719569
1870793
19320835
201805563
2112416113
2287073927

[1,1,1,1,1,1,1,1,5,13,25,43,89,283,1197,5015,
 19569,70793,320835,1805563,12416113,87073927]