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”).

A005252 as a simple table

na(n)
01
11
21
31
42
54
67
711
817
927
1044
1172
12117
13189
14305
15493
16798
171292
182091
193383
205473
218855
2214328
2323184
2437513
2560697
2698209
27158905
28257114
29416020
30673135
311089155
321762289
332851443
344613732
357465176
3612078909
3719544085
3831622993

[1,1,1,1,2,4,7,11,17,27,44,72,117,189,305,493,798,
 1292,2091,3383,5473,8855,14328,23184,37513,60697,
 98209,158905,257114,416020,673135,1089155,1762289,
 2851443,4613732,7465176,12078909,19544085,
 31622993]