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A259354 as a simple table

na(n)
11
21
34
419
5136
61226
712259
8130435
91441755
1016390266
11190484723
122254489731
1327096464528
14329995577356
154065180800962
1650584233942184

[1,1,4,19,136,1226,12259,130435,1441755,16390266,
 190484723,2254489731,27096464528,329995577356,
 4065180800962,50584233942184]