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”).

A040409 as a simple table

na(n)
020
11
22
31
43
51
66
78
86
91
103
111
122
131
1440
151
162
171
183
191
206
218
226
231
243
251
262
271
2840
291
302
311
323
331
346
358
366
371
383
391
402
411
4240
431
442
451
463
471
486
498
506
511
523
531
542
551
5640
571
582
591
603
611
626
638
646
651
663
671
682
691
7040
711
722
731
743
751
766
778
786
791
803
811
822
831
8440
851
862
871
883
891

[20,1,2,1,3,1,6,8,6,1,3,1,2,1,40,1,2,1,3,1,6,8,6,
 1,3,1,2,1,40,1,2,1,3,1,6,8,6,1,3,1,2,1,40,1,2,1,3,
 1,6,8,6,1,3,1,2,1,40,1,2,1,3,1,6,8,6,1,3,1,2,1,40,
 1,2,1,3,1,6,8,6,1,3,1,2,1,40,1,2,1,3,1]