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A147412 as a simple table

na(n)
11
21
31
41
51
65
717
841
9185
10633
112157
127997
1347735
14277209
152208471
1617450513
17197122185
182176282667
1931077679505

[1,1,1,1,1,5,17,41,185,633,2157,7997,47735,277209,
 2208471,17450513,197122185,2176282667,31077679505]