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”).

A180108 as a simple table

na(n)
00
11
22
31
42
54
62
73
86
93
104
118
129
1310
145
156
1612
176
187
1914
2015
2116
228
239
2418
259
2610
2720
2821
2922
3011
3112
3224
3325
3426
3527
3628
3714
3815
3930
4015
4116
4232
4333
4434
4535
4636
4718
4819
4938
5039
5140
5220
5321
5442
5521
5622
5744
5845
5946
6023
6124
6248
6349
6450
6551
6652
6726
6827
6954
7055
7156
7257
7358
7429
7530

[0,1,2,1,2,4,2,3,6,3,4,8,9,10,5,6,12,6,7,14,15,16,
 8,9,18,9,10,20,21,22,11,12,24,25,26,27,28,14,15,
 30,15,16,32,33,34,35,36,18,19,38,39,40,20,21,42,
 21,22,44,45,46,23,24,48,49,50,51,52,26,27,54,55,
 56,57,58,29,30]