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A146600 as a simple table

na(n)
11
21
31
41
51
61
75
819
939
1083
11233
12711
132313
148511
1540097
16191977
171081845
186288993
1941547129
20292524045
212387601825
2220697818111

[1,1,1,1,1,1,5,19,39,83,233,711,2313,8511,40097,
 191977,1081845,6288993,41547129,292524045,
 2387601825,20697818111]