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”).

A270921 as a simple table

na(n)
01
12
23
33
42
51
61
73
83
93
104
113
121
131
141
152
165
173
183
193
203
214
223
234
246
253
266
274
283
294
302
313
323
332
342
353
362
372
384
393
403
415
429
436
443
454
462
472
482
496
503
513
522
532
543
552
562
574
585
594
605
613
622
632
646
657
664
674
682
692
704
713
723
733
742
753
764
774
784
792
805

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