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A212561 as a simple table

na(n)
00
10
21
35
412
526
645
775
8112
9164
10225
11305
12396
13510
14637
15791
16960
171160
181377
191629
201900
212210
222541
232915
243312
253756
264225
274745
285292
295894
306525
317215
327936
338720
349537
3510421
3611340
3712330
3813357
3914459
4015600
4116820
4218081
4319425

[0,0,1,5,12,26,45,75,112,164,225,305,396,510,637,
 791,960,1160,1377,1629,1900,2210,2541,2915,3312,
 3756,4225,4745,5292,5894,6525,7215,7936,8720,9537,
 10421,11340,12330,13357,14459,15600,16820,18081,
 19425]