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”).

A253028 as a simple table

na(n)
11
22
33
44
51
65
76
82
93
107
118
129
134
141
155
1610
1711
186
192
203
217
2212
2313
2414
2515
268
2716
2817
299
304
311
325
3310
3418
3519
3611
376
382
393
407
4112
4220
4321
4413
458
464
471
485
499
5014
5122
5223
5315
5416
5524
5625
5726
5817
5910
6018
6127
6228
6319
6411
656
662
673
687
6912
7020
7129
7230
7321
7413
758

[1,2,3,4,1,5,6,2,3,7,8,9,4,1,5,10,11,6,2,3,7,12,
 13,14,15,8,16,17,9,4,1,5,10,18,19,11,6,2,3,7,12,
 20,21,13,8,4,1,5,9,14,22,23,15,16,24,25,26,17,10,
 18,27,28,19,11,6,2,3,7,12,20,29,30,21,13,8]