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A075064 as a simple table

na(n)
19
225
391
4841
56931
630031
7510511
89699691
9223092871
106469693231
11601681470391
127420738134811
13304250263527211
1413082761331670031
15614889782588491411
1632589158477190044731
171922760350154212639071

[9,25,91,841,6931,30031,510511,9699691,223092871,
 6469693231,601681470391,7420738134811,
 304250263527211,13082761331670031,
 614889782588491411,32589158477190044731,
 1922760350154212639071]