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”).

A043558 as a simple table

na(n)
01
11
21
31
41
51
62
71
82
92
102
112
122
132
141
152
162
172
182
192
202
211
222
232
242
252
262
272
281
292
302
312
322
332
342
351
362
373
383
393
403
413
422
431
442
452
462
472
483
493
502
513
523
533
543
553
563
572
583
593
603
613
623
633
642
653
663
673
683
693
703
712
722
733
743
753
763
773
783
792
803
813
823
833
842
852
861
872
882
892

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