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”).

A128220 as a simple table

na(n)
11
23
32
44
54
63
75
85
95
104
116
126
136
146
155
167
177
187
197
207
216
228
238
248
258
268
278
287
299
309
319
329
339
349
359
368
3710
3810
3910
4010
4110
4210
4310
4410
459
4611
4711
4811
4911
5011
5111
5211
5311
5411
5510

[1,3,2,4,4,3,5,5,5,4,6,6,6,6,5,7,7,7,7,7,6,8,8,8,
 8,8,8,7,9,9,9,9,9,9,9,8,10,10,10,10,10,10,10,10,9,
 11,11,11,11,11,11,11,11,11,10]