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A139818 as a simple table

na(n)
00
11
21
39
425
5121
6441
71849
87225
929241
10116281
11466489
121863225
137458361
1429822521
15119311929
16477204025
171908903481
187635439161
1930542106169
20122167725625
21488672300601
221954686406201
237818751217209
2431274993684025

[0,1,1,9,25,121,441,1849,7225,29241,116281,466489,
 1863225,7458361,29822521,119311929,477204025,
 1908903481,7635439161,30542106169,122167725625,
 488672300601,1954686406201,7818751217209,
 31274993684025]