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”).

A171387 as a simple table

na(n)
10
20
30
40
51
60
71
80
90
100
111
120
131
140
150
160
171
180
191
200
210
220
231
240
250
260
270
280
291
300
311
320
330
340
350
360
371
380
390
400
411
420
431
440
450
460
471
480
490
500
510
520
531
540
550
560
570
580
591
600
611
620
630
640
650
660
671
680
690
700
711
720
731
740
750
760
770
780
791
800
810
820
831
840
850
860
870
880
891
900
910
920
930
940
950
960
971
980
990
1000
1011
1020
1031
1040
1050

[0,0,0,0,1,0,1,0,0,0,1,0,1,0,0,0,1,0,1,0,0,0,1,0,
 0,0,0,0,1,0,1,0,0,0,0,0,1,0,0,0,1,0,1,0,0,0,1,0,0,
 0,0,0,1,0,0,0,0,0,1,0,1,0,0,0,0,0,1,0,0,0,1,0,1,0,
 0,0,0,0,1,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,0,0,1,0,0,
 0,1,0,1,0,0]