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”).

A023139 as a simple table

na(n)
11
22
33
43
52
66
71
85
95
104
112
129
132
142
156
169
172
1810
197
207
213
224
232
2415
257
264
277
283
295
3012
313
3213
336
344
352
3615
375
3814
396
4013
412
426
438
447
4510
464
473
4827
491
5014
516
527
533
5414
555
565
5721
5810
593
6021
612
626
635
6417
657
6612
672
687
696
704
712
7225
734
7410
7521
7621
772
7812
792
8025
819
824
833
849
857
8616
8715
8813
892
9020
912
927
939
946

[1,2,3,3,2,6,1,5,5,4,2,9,2,2,6,9,2,10,7,7,3,4,2,
 15,7,4,7,3,5,12,3,13,6,4,2,15,5,14,6,13,2,6,8,7,
 10,4,3,27,1,14,6,7,3,14,5,5,21,10,3,21,2,6,5,17,7,
 12,2,7,6,4,2,25,4,10,21,21,2,12,2,25,9,4,3,9,7,16,
 15,13,2,20,2,7,9,6]