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A146403 as a simple table

na(n)
11
21
31
41
51
61
77
819
947
1085
11259
12857
133329
1413923
1576419
16375879
172500865
1815196877
19126783213
20979497309
2110344645479
22100578970271

[1,1,1,1,1,1,7,19,47,85,259,857,3329,13923,76419,
 375879,2500865,15196877,126783213,979497309,
 10344645479,100578970271]