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”).

A030381 as a simple table

na(n)
11
21
31
41
53
61
71
81
91
101
112
121
131
141
151
161
172
181
191
201
212
222
232
245
251
261
271
282
291
301
311
321
332
341
351
361
371
381
391
402
411
421
431
441
451
461
472
481
491
501
511
521
531
541
551
561
571
581
591
602
612
623
632
641
651
661
671
681
691
701
711
721
732
741
751
761
771
781
792
801
811
821
832
841
851
861
871
881
893
901

[1,1,1,1,3,1,1,1,1,1,2,1,1,1,1,1,2,1,1,1,2,2,2,5,
 1,1,1,2,1,1,1,1,2,1,1,1,1,1,1,2,1,1,1,1,1,1,2,1,1,
 1,1,1,1,1,1,1,1,1,1,2,2,3,2,1,1,1,1,1,1,1,1,1,2,1,
 1,1,1,1,2,1,1,1,2,1,1,1,1,1,3,1]