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”).

A280910 as a simple table

na(n)
00
11
21
30
40
50
61
70
80
90
101
110
121
130
140
150
160
170
180
190
200
210
221
230
240
250
260
270
281
290
300
310
320
330
340
350
360
370
381
390
400
410
421
430
440
450
460
470
480
490
500
510
521
530
540
550
561
570
580
590
600
610
620
630
640
650
660
670
680
690
700
710
720
730
740
750
760
770
781
790
800
810
820
830
840
850
860
870
880
890
901
910
920
930
940
950
960
970
980
990
1000
1010
1020
1030
1040
1050
1060
1070
1081
1090
1100
1110
1120
1130
1140
1150
1160
1170
1180
1190
1201

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