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A331528 as a simple table

na(n)
00
11
221
3156
4700
52325
66321
714896
831536
961425
10111925
11193116
12318396
13505141
14775425
151156800
161683136
172395521
183343221
194584700
206188700
218235381
2210817521
2314041776
2418030000
2522920625
2628870101
2736054396
2844670556
2954938325
3067101825
3181431296
3298224896

[0,1,21,156,700,2325,6321,14896,31536,61425,
 111925,193116,318396,505141,775425,1156800,
 1683136,2395521,3343221,4584700,6188700,8235381,
 10817521,14041776,18030000,22920625,28870101,
 36054396,44670556,54938325,67101825,81431296,
 98224896]