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A006021 as a simple table

na(n)
00
11
22
33
41
54
63
72
80
95
102
113
121
134
143
152
160
175
182
193
201
214
223
232
240
255
262
273
281
294
303
312
320
335
342
353
361
374
383
392
400
415
422
433
441
454
463
472
480
495
502
513
521
534
543
552
560
575
582
593
601
614
623
632
640
655
662
673
681
694
703
712
720
735
742
753
761
774
783
792
800
815
822

[0,1,2,3,1,4,3,2,0,5,2,3,1,4,3,2,0,5,2,3,1,4,3,2,
 0,5,2,3,1,4,3,2,0,5,2,3,1,4,3,2,0,5,2,3,1,4,3,2,0,
 5,2,3,1,4,3,2,0,5,2,3,1,4,3,2,0,5,2,3,1,4,3,2,0,5,
 2,3,1,4,3,2,0,5,2]