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”).

A131838 as a simple table

na(n)
10
20
31
42
53
63
72
81
91
101
112
122
131
142
152
161
175
182
192
201
211
228
233
241
251
261
272
282
292
302
311
322
332
342
351
361
371
381
391
401
411
422
432
441
452
462
471
481
492
502
511
521
531
541
551
561
571
582
591
601
611
621
631
641
651
661
671
681
691
701
711
721
731
741
752
762
771
781
791
801
811
821
831
841
851
861
871
881
891
901
911
921
931
941
951
961
971
981
991
1001
1011
1021
1031
1041
1051

[0,0,1,2,3,3,2,1,1,1,2,2,1,2,2,1,5,2,2,1,1,8,3,1,
 1,1,2,2,2,2,1,2,2,2,1,1,1,1,1,1,1,2,2,1,2,2,1,1,2,
 2,1,1,1,1,1,1,1,2,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
 2,2,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
 1,1,1,1,1,1]