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”).

A272917 as a simple table

na(n)
11
21
31
41
51
61
71
81
91
101
111
121
132
141
152
163
173
181
191
202
211
224
231
245
251
262
272
283
292
305
311
328
331
341
353
364
374
381
3910
402
4113
422
431
445
456
465
472
483
4915
503
5121
523
531
541
558
5610
5710
581
594
6025
615
6234
635
641
652
6613
6716
6815
693
702
715
7240
738
7455
758
761
771
783
7921
8026
8125

[1,1,1,1,1,1,1,1,1,1,1,1,2,1,2,3,3,1,1,2,1,4,1,5,
 1,2,2,3,2,5,1,8,1,1,3,4,4,1,10,2,13,2,1,5,6,5,2,3,
 15,3,21,3,1,1,8,10,10,1,4,25,5,34,5,1,2,13,16,15,
 3,2,5,40,8,55,8,1,1,3,21,26,25]