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A265153 as a simple table

na(n)
115
221
3316
4969
56996
655401
7390625
81827776
92562500
108273225
1137136225
1238371001
1343037561
14258421444
15792669636
162928667041
1738512058944
18260125180889
19405701529401
20688085041025
215890084946609
2222508111494025
2364017148660004
24537387232526336
254166255964768676

[15,21,316,969,6996,55401,390625,1827776,2562500,
 8273225,37136225,38371001,43037561,258421444,
 792669636,2928667041,38512058944,260125180889,
 405701529401,688085041025,5890084946609,
 22508111494025,64017148660004,537387232526336,
 4166255964768676]