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”).

A087133 as a simple table

na(n)
11
22
32
42
52
63
72
82
92
103
112
123
132
143
153
162
172
183
192
204
213
223
232
243
252
263
272
284
292
304
312
322
333
343
353
363
372
383
393
404
412
425
432
444
453
463
472
483
492
503
513
524
532
543
553
564
573
583
592
605
612
623
633
642
653
665
672
684
693
704
712
723
732
743
753
764
773
785
792
804
812
823
832
846
853
863
873
885
892
904
913
924
933
943
953
963
972
983
994
1004

[1,2,2,2,2,3,2,2,2,3,2,3,2,3,3,2,2,3,2,4,3,3,2,3,
 2,3,2,4,2,4,2,2,3,3,3,3,2,3,3,4,2,5,2,4,3,3,2,3,2,
 3,3,4,2,3,3,4,3,3,2,5,2,3,3,2,3,5,2,4,3,4,2,3,2,3,
 3,4,3,5,2,4,2,3,2,6,3,3,3,5,2,4,3,4,3,3,3,3,2,3,4,
 4]