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A289625 as a simple table

na(n)
11
21
34
44
516
64
764
836
964
1016
111024
1236
134096
1464
15144
16144
1765536
1864
19262144
20144
21576
221024
234194304
24900
251048576
264096
27262144
28576
29268435456
30144
311073741824
322304
339216
3465536
3536864
36576
3768719476736
38262144
3936864
403600
411099511627776
42576
434398046511104
449216
4536864
464194304
4770368744177664
483600
494398046511104
501048576
51589824
5236864

[1,1,4,4,16,4,64,36,64,16,1024,36,4096,64,144,144,
 65536,64,262144,144,576,1024,4194304,900,1048576,
 4096,262144,576,268435456,144,1073741824,2304,
 9216,65536,36864,576,68719476736,262144,36864,
 3600,1099511627776,576,4398046511104,9216,36864,
 4194304,70368744177664,3600,4398046511104,1048576,
 589824,36864]