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A015237 as a simple table

na(n)
00
11
212
345
4112
5225
6396
7637
8960
91377
101900
112541
123312
134225
145292
156525
167936
179537
1811340
1913357
2015600
2118081
2220812
2323805
2427072
2530625
2634476
2738637
2843120
2947937
3053100
3158621
3264512

[0,1,12,45,112,225,396,637,960,1377,1900,2541,
 3312,4225,5292,6525,7936,9537,11340,13357,15600,
 18081,20812,23805,27072,30625,34476,38637,43120,
 47937,53100,58621,64512]