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”).

A168185 as a simple table

na(n)
00
11
21
31
41
51
61
71
81
91
101
111
120
131
141
151
161
171
181
191
201
211
221
231
240
251
261
271
281
291
301
311
321
331
341
351
360
371
381
391
401
411
421
431
441
451
461
471
480
491
501
511
521
531
541
551
561
571
581
591
600
611
621
631
641
651
661
671
681
691
701
711
720
731
741
751
761
771
781
791
801
811
821
831
840
851
861
871
881
891
901
911
921
931
941
951
960
971
981
991
1001
1011
1021
1031
1041

[0,1,1,1,1,1,1,1,1,1,1,1,0,1,1,1,1,1,1,1,1,1,1,1,
 0,1,1,1,1,1,1,1,1,1,1,1,0,1,1,1,1,1,1,1,1,1,1,1,0,
 1,1,1,1,1,1,1,1,1,1,1,0,1,1,1,1,1,1,1,1,1,1,1,0,1,
 1,1,1,1,1,1,1,1,1,1,0,1,1,1,1,1,1,1,1,1,1,1,0,1,1,
 1,1,1,1,1,1]