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A264515 as a simple table

na(n)
11
21
39
436
5144
6576
72116
88281
931329
10121801
11467856
121809025
136969600
1426884225
15103632400
16399560121
171540484001
185939322489
1922899558276
2088289802496
21340406901136
221312449766884
235060209759081
2419509827162049
2575220946346001

[1,1,9,36,144,576,2116,8281,31329,121801,467856,
 1809025,6969600,26884225,103632400,399560121,
 1540484001,5939322489,22899558276,88289802496,
 340406901136,1312449766884,5060209759081,
 19509827162049,75220946346001]