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”).

A275421 as a simple table

na(n)
11
21
31
43
51
61
75
84
91
101
1112
128
134
141
151
1630
1723
189
194
201
211
2279
2357
2426
259
264
271
281
29227
30160
3168
3227
339
344
351
361
37710
38456
39197
4071
4127
429
434
441
451
462322
471402
48567
49208
5072
5127
529
534
541
551
568071
574468
581748
59604
60211
6172
6227
639
644
651
661
6729503
6815071
695555
701874

[1,1,1,3,1,1,5,4,1,1,12,8,4,1,1,30,23,9,4,1,1,79,
 57,26,9,4,1,1,227,160,68,27,9,4,1,1,710,456,197,
 71,27,9,4,1,1,2322,1402,567,208,72,27,9,4,1,1,
 8071,4468,1748,604,211,72,27,9,4,1,1,29503,15071,
 5555,1874]