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A146408 as a simple table

na(n)
11
21
31
41
51
67
721
853
9267
101477
1111799
12115813
131314119
1418659927
15340219403
167888629683
17233265020067
188619893688875
19395425329029435
2022778671927694919
211657248108130816043

[1,1,1,1,1,7,21,53,267,1477,11799,115813,1314119,
 18659927,340219403,7888629683,233265020067,
 8619893688875,395425329029435,22778671927694919,
 1657248108130816043]