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”).

A375120 as a simple table

na(n)
11
21
31
41
51
61
71
81
91
101
111
122
131
141
151
162
171
182
191
202
211
221
231
244
251
261
271
282
291
303
311
323
331
341
351
366
371
381
391
404
411
423
431
442
452
461
471
489
491
502
511
522
531
544
551
564
571
581
591
609
611
621
632
646
651
663
671
682
691
703
711
7215
731
741
752
762
771
783
791
809
812
821
831
849
851
861
871

[1,1,1,1,1,1,1,1,1,1,1,2,1,1,1,2,1,2,1,2,1,1,1,4,
 1,1,1,2,1,3,1,3,1,1,1,6,1,1,1,4,1,3,1,2,2,1,1,9,1,
 2,1,2,1,4,1,4,1,1,1,9,1,1,2,6,1,3,1,2,1,3,1,15,1,
 1,2,2,1,3,1,9,2,1,1,9,1,1,1]