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A081861 as a simple table

na(n)
10
21
35
414
531
655
791
8146
9204
10285
11400
12506
13655
14850
151015
161240
171552
181804
192109
202562
212870
223311
233971
244324
254914
265730
276201
286990
298000
308555
319455
3210846
3311536
3412529
3514192
3614910
3716206
3818371
3919088
4020540
4122990
4223821
4325794

[0,1,5,14,31,55,91,146,204,285,400,506,655,850,
 1015,1240,1552,1804,2109,2562,2870,3311,3971,4324,
 4914,5730,6201,6990,8000,8555,9455,10846,11536,
 12529,14192,14910,16206,18371,19088,20540,22990,
 23821,25794]