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”).

A060904 as a simple table

na(n)
11
21
31
41
55
61
71
81
91
105
111
121
131
141
155
161
171
181
191
205
211
221
231
241
2525
261
271
281
291
305
311
321
331
341
355
361
371
381
391
405
411
421
431
441
455
461
471
481
491
5025
511
521
531
541
555
561
571
581
591
605
611
621
631
641
655
661
671
681
691
705
711
721
731
741
7525
761
771
781
791
805
811
821
831
841
855
861
871
881
891
905
911
921
931
941
955
961
971
981
991

[1,1,1,1,5,1,1,1,1,5,1,1,1,1,5,1,1,1,1,5,1,1,1,1,
 25,1,1,1,1,5,1,1,1,1,5,1,1,1,1,5,1,1,1,1,5,1,1,1,
 1,25,1,1,1,1,5,1,1,1,1,5,1,1,1,1,5,1,1,1,1,5,1,1,
 1,1,25,1,1,1,1,5,1,1,1,1,5,1,1,1,1,5,1,1,1,1,5,1,
 1,1,1]