login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A053839 as a simple table

na(n)
00
11
22
33
41
52
63
70
82
93
100
111
123
130
141
152
161
172
183
190
202
213
220
231
243
250
261
272
280
291
302
313
322
333
340
351
363
370
381
392
400
411
422
433
441
452
463
470
483
490
501
512
520
531
542
553
561
572
583
590
602
613
620
631
641
652
663
670
682
693
700
711
723
730
741
752
760
771
782
793
802
813
820
831
843
850
861
872
880
891
902
913
921
932
943
950
963
970
981
992
1000
1011
1022
1033
1041

[0,1,2,3,1,2,3,0,2,3,0,1,3,0,1,2,1,2,3,0,2,3,0,1,
 3,0,1,2,0,1,2,3,2,3,0,1,3,0,1,2,0,1,2,3,1,2,3,0,3,
 0,1,2,0,1,2,3,1,2,3,0,2,3,0,1,1,2,3,0,2,3,0,1,3,0,
 1,2,0,1,2,3,2,3,0,1,3,0,1,2,0,1,2,3,1,2,3,0,3,0,1,
 2,0,1,2,3,1]