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”).

A073458 as a simple table

na(n)
10
20
30
40
51
61
71
81
91
101
111
121
131
141
151
162
172
182
192
202
212
222
232
242
252
262
272
282
292
302
312
322
332
342
352
362
372
382
392
403
413
423
433
443
453
463
473
483
493
503
513
523
533
543
553
563
573
583
593
603
613
623
633
643
653
663
673
683
693
703
713
723
733
743
753
763
773
783
793
803
813
823
833
843
853
863
873
883
893
903
913
923
933
943
953
963
973
984
993
1004
1014
1024
1034
1044
1054

[0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,2,
 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,3,3,3,3,3,3,3,3,3,3,
 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,
 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,4,3,
 4,4,4,4,4,4]