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A147177 as a simple table

na(n)
11
21
31
41
51
65
725
893
9439
101973
119767
1271707
13630927
147316817
1594092203
161666775933

[1,1,1,1,1,5,25,93,439,1973,9767,71707,630927,
 7316817,94092203,1666775933]