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”).

A025126 as a simple table

na(n)
11
21
30
41
51
61
72
82
91
102
112
121
132
142
152
162
172
182
192
203
213
222
233
243
253
263
273
282
293
303
313
323
333
342
353
363
372
383
394
404
414
424
433
444
454
464
474
484
494
504
514
524
533
544
553
564
574
583
594
604
614
624
634
643
654
664
674
684
695
705
715
725
735
744
755
765
775
785
795
805
815
825
834
845
855
864
875
885
894
905
915
924
935
945
955
965
975
985
995
1005
1015
1024
1035
1045
1055
1065
1075
1085
1095
1105
1116

[1,1,0,1,1,1,2,2,1,2,2,1,2,2,2,2,2,2,2,3,3,2,3,3,
 3,3,3,2,3,3,3,3,3,2,3,3,2,3,4,4,4,4,3,4,4,4,4,4,4,
 4,4,4,3,4,3,4,4,3,4,4,4,4,4,3,4,4,4,4,5,5,5,5,5,4,
 5,5,5,5,5,5,5,5,4,5,5,4,5,5,4,5,5,4,5,5,5,5,5,5,5,
 5,5,4,5,5,5,5,5,5,5,5,6]