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”).

A025425 as a simple table

na(n)
01
11
21
31
42
52
62
72
83
94
104
113
124
135
144
154
166
176
187
196
207
218
228
237
249
2511
2610
2710
2811
2912
3012
3112
3213
3315
3416
3513
3617
3718
3817
3917
4020
4120
4221
4320
4420
4525
4623
4722
4825
4927
5027
5126
5229
5330
5433
5531
5632
5736
5837
5933
6035
6140
6238
6340
6441
6542
6646
6743
6844
6949
7050
7147
7254
7354
7454
7554
7655
7758
7860
7961

[1,1,1,1,2,2,2,2,3,4,4,3,4,5,4,4,6,6,7,6,7,8,8,7,
 9,11,10,10,11,12,12,12,13,15,16,13,17,18,17,17,20,
 20,21,20,20,25,23,22,25,27,27,26,29,30,33,31,32,
 36,37,33,35,40,38,40,41,42,46,43,44,49,50,47,54,
 54,54,54,55,58,60,61]