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”).

A030419 as a simple table

na(n)
11
21
32
41
51
61
71
82
92
101
111
121
131
142
151
161
171
181
191
202
211
221
231
241
251
261
271
281
291
301
311
322
331
341
352
361
371
381
391
401
411
421
431
442
452
461
473
481
492
501
511
521
531
543
552
561
571
582
591
602
611
621
631
641
651
661
671
681
692
703
711
721
731
741
751
761
771
781
791
801
812
823
831
841
851
861
872
882
891
901

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