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”).

A331730 as a simple table

na(n)
11
22
33
44
53
64
73
85
94
104
113
125
133
144
156
167
173
188
193
205
216
224
233
247
254
264
275
285
293
308
313
329
336
344
356
367
373
384
396
407
413
428
433
445
4510
464
473
489
494
5011
516
525
533
547
5512
567
576
584
593
607
613
624
6310
6413
6512
668
673
685
696
7011
713
729
733
744
758
765
776
788
793
809
817
824
833
847
8512
864
876
887
893
907
9112
925
936
944
9512
9613
973
9814
9910
1007
1013
1028
1033
1047
10515

[1,2,3,4,3,4,3,5,4,4,3,5,3,4,6,7,3,8,3,5,6,4,3,7,
 4,4,5,5,3,8,3,9,6,4,6,7,3,4,6,7,3,8,3,5,10,4,3,9,
 4,11,6,5,3,7,12,7,6,4,3,7,3,4,10,13,12,8,3,5,6,11,
 3,9,3,4,8,5,6,8,3,9,7,4,3,7,12,4,6,7,3,7,12,5,6,4,
 12,13,3,14,10,7,3,8,3,7,15]