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”).

A043535 as a simple table

na(n)
11
21
31
41
51
61
71
82
91
102
112
122
132
142
152
162
172
181
192
202
212
222
232
242
252
262
271
282
292
302
312
322
332
342
352
361
372
382
392
402
412
422
432
442
451
462
472
482
492
502
512
522
532
541
552
562
572
582
592
602
612
622
631
642
652
663
673
683
693
703
713
722
731
742
752
762
772
782
792
803
812
822
833
843
853
863
873
883
892
903

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