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A221285 as a simple table

na(n)
11
24
316
436
564
6100
7144
8196
9256
10324
11400
12576
13676
14784
15900
161024
171296
181600
191764
201936
212304
222500
232704
242916
253136
263600
274096
284356
294624
304900
315184
325476
336400
347056
357744
368100
378836
389216
3910000
4010816
4111664
4212100
4312544
4412996
4513456
4614400
4715376
4815876

[1,4,16,36,64,100,144,196,256,324,400,576,676,784,
 900,1024,1296,1600,1764,1936,2304,2500,2704,2916,
 3136,3600,4096,4356,4624,4900,5184,5476,6400,7056,
 7744,8100,8836,9216,10000,10816,11664,12100,12544,
 12996,13456,14400,15376,15876]