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A015489 as a simple table

na(n)
01
14
217
3289
418785
54827745
64948438625
720273753046625
8332185443668950625
921770437421732017110625
105707011317919939625464790625
115984240806710536532650993759190625

[1,4,17,289,18785,4827745,4948438625,
 20273753046625,332185443668950625,
 21770437421732017110625,
 5707011317919939625464790625,
 5984240806710536532650993759190625]