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”).

A127972 as a simple table

na(n)
01
11
21
31
40
51
61
70
80
91
100
110
121
130
141
151
160
171
180
191
201
210
220
231
240
250
260
271
281
290
300
310
320
330
340
351
360
370
380
390
401
410
420
430
441
451
460
471
480
490
500
510
520
531
541
550
560
570
580
591
600
611
620
631
640
651
661
670
680
690
701
710

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