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”).

A331023 as a simple table

na(n)
11
21
31
42
51
61
71
83
92
101
111
124
131
141
151
165
171
184
191
204
211
221
231
247
252
261
273
284
291
301
311
327
331
341
351
369
371
381
391
407
411
421
431
444
454
461
471
4812
492
504
511
524
531
547
551
567
571
581
591
6011
611
621
634
6411
651
661
671
684
691
701
711
7216
731
741
754
764
771
781
791
8012
815
821
831
8411
851
861
871
887
891
9011
911
924
931
941
951
9619
971
984
994
1009
1011
1021
1031
1047
1051

[1,1,1,2,1,1,1,3,2,1,1,4,1,1,1,5,1,4,1,4,1,1,1,7,
 2,1,3,4,1,1,1,7,1,1,1,9,1,1,1,7,1,1,1,4,4,1,1,12,
 2,4,1,4,1,7,1,7,1,1,1,11,1,1,4,11,1,1,1,4,1,1,1,
 16,1,1,4,4,1,1,1,12,5,1,1,11,1,1,1,7,1,11,1,4,1,1,
 1,19,1,4,4,9,1,1,1,7,1]