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”).

A108415 as a simple table

na(n)
21
32
41
53
61
73
81
91
103
111
123
133
141
151
162
173
181
193
203
211
223
231
241
253
263
271
283
291
301
313
321
333
341
353
361
372
383
391
402
413
421
433
441
453
461
472
483
493
501
511
523
531
543
552
562
573
581
593
603
611
621
633
643
651
661
673
681
693
701
711
721
733
742
753
761
771
783
791
801
813
821
833
841
853
861
871
883
893
901
911
923
933
941
953
961
971
983
991
1003
1011
1023
1032
1043
1051
1061

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