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”).

A130973 as a simple table

na(n)
11
21
32
41
54
63
74
82
91
103
111
122
133
1410
154
167
174
183
192
201
212
2218
232
242
2517
261
272
286
299
303
311
321
331
348
353
362
3715
381
394
401
411
427
437
444
454
463
474
481
491
507
512
525
531
545
5518
562
575
584
593
601
615
621
6318
6412
652
668
671
684
692
705
714
721
731
741
759
7610

[1,1,2,1,4,3,4,2,1,3,1,2,3,10,4,7,4,3,2,1,2,18,2,
 2,17,1,2,6,9,3,1,1,1,8,3,2,15,1,4,1,1,7,7,4,4,3,4,
 1,1,7,2,5,1,5,18,2,5,4,3,1,5,1,18,12,2,8,1,4,2,5,
 4,1,1,1,9,10]