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”).

A064287 as a simple table

na(n)
10
20
31
40
50
60
71
80
90
102
111
120
130
140
153
160
172
180
191
200
210
222
231
242
252
260
271
280
290
300
315
320
330
342
351
364
372
382
391
400
410
424
431
444
454
466
471
480
490
500
511
526
530
540
551
560
572
584
593
600
612
620
639
640
650
664
673
680
690
702
711
720
734
740
755
764
776
780
791
804
810
824
831
840
850
860
873
880
890
900
911
920
932
948
951
960
976
980
991
1000
1012
1020
1033
1040
1050

[0,0,1,0,0,0,1,0,0,2,1,0,0,0,3,0,2,0,1,0,0,2,1,2,
 2,0,1,0,0,0,5,0,0,2,1,4,2,2,1,0,0,4,1,4,4,6,1,0,0,
 0,1,6,0,0,1,0,2,4,3,0,2,0,9,0,0,4,3,0,0,2,1,0,4,0,
 5,4,6,0,1,4,0,4,1,0,0,0,3,0,0,0,1,0,2,8,1,0,6,0,1,
 0,2,0,3,0,0]