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”).

A204260 as a simple table

na(n)
11
21
31
41
51
61
71
82
92
101
111
122
132
142
151
161
172
182
192
202
211
221
232
242
252
262
272
281
291
302
312
323
333
342
352
361
371
382
393
403
413
423
433
442
451
461
472
483
493
503
513
523
533
542
551
561
572
583
593
603
613
623
633
643
652
661
671
682
693
703
714
724
734
744
753
763
772
781
791
802
813
823
834
844
854
864
874
883
893
902
911
921
932
943
953
964
974
984
994

[1,1,1,1,1,1,1,2,2,1,1,2,2,2,1,1,2,2,2,2,1,1,2,2,
 2,2,2,1,1,2,2,3,3,2,2,1,1,2,3,3,3,3,3,2,1,1,2,3,3,
 3,3,3,3,2,1,1,2,3,3,3,3,3,3,3,2,1,1,2,3,3,4,4,4,4,
 3,3,2,1,1,2,3,3,4,4,4,4,4,3,3,2,1,1,2,3,3,4,4,4,4]