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A074187 as a simple table

na(n)
11
21
34
416
5100
6676
74913
840000
9362404
103625216
1139904489
12478996996
136226945921
1487177877081
151307672296225
1620922784184449
17355687416544329
186402373660047556
19121645099966283776
202432902006216007824

[1,1,4,16,100,676,4913,40000,362404,3625216,
 39904489,478996996,6226945921,87177877081,
 1307672296225,20922784184449,355687416544329,
 6402373660047556,121645099966283776,
 2432902006216007824]