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A253721 as a simple table

na(n)
18
22
38
40
57
68
70
82
94
105
110
122
133
146
158
160
175
186
198
202
218
229
232
245
250
264
276
287
294
305
310
328
337
348
353
364
374
385
390
401
412
424
435
442
456
468
470
485
497
502
512
520
531
546
558
562
574
585
596
605
618
621
636
648
653
665
679
682
694
705
716
720
732
740
756
768
772
785
792
803
818
823
835
844
856
867

[8,2,8,0,7,8,0,2,4,5,0,2,3,6,8,0,5,6,8,2,8,9,2,5,
 0,4,6,7,4,5,0,8,7,8,3,4,4,5,0,1,2,4,5,2,6,8,0,5,7,
 2,2,0,1,6,8,2,4,5,6,5,8,1,6,8,3,5,9,2,4,5,6,0,2,0,
 6,8,2,5,2,3,8,3,5,4,6,7]