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”).

A266685 as a simple table

na(n)
01
12
21
31
42
51
64
71
81
92
103
112
121
136
141
151
162
171
184
191
202
211
228
231
241
252
261
272
285
292
301
312
321
3310
341
351
362
373
384
391
406
411
424
433
442
451
4612
471
481
492
501
512
521
532
547
552
561
572
581
592
601
6114
621
631
642
651
664
671
682
691
708
711
722
731
744
751
762
771
7816
791
801
812
823
832
841
856
861
872
889
892
901
916
921
932
943
952
961
9718

[1,2,1,1,2,1,4,1,1,2,3,2,1,6,1,1,2,1,4,1,2,1,8,1,
 1,2,1,2,5,2,1,2,1,10,1,1,2,3,4,1,6,1,4,3,2,1,12,1,
 1,2,1,2,1,2,7,2,1,2,1,2,1,14,1,1,2,1,4,1,2,1,8,1,
 2,1,4,1,2,1,16,1,1,2,3,2,1,6,1,2,9,2,1,6,1,2,3,2,
 1,18]