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A146940 as a simple table

na(n)
11
21
31
43
55
69
719
860
9189
10892
113177
1218960
1389571
14754227
154905159
1653337014
17466215312
186729449504
1978188089715
201533329125669

[1,1,1,3,5,9,19,60,189,892,3177,18960,89571,
 754227,4905159,53337014,466215312,6729449504,
 78188089715,1533329125669]