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”).

A090044 as a simple table

na(n)
02
12
22
32
41
52
62
70
80
92
102
112
120
132
142
152
161
172
182
191
202
212
220
230
241
250
260
272
282
292
300
311
321
330
342
352
362
371
382
391
402
411
422
431
442
452
460
470
480
490
500
510
520
530
542
552
562
570
580
590
600
610
620
630
642
652
662
671
682
690
700
710
720
730
740
752
761
772
782
790
800
812
820
830
840
850
860
872
880
890
902
912
922
930
942
952
960
970
980
990
1002
1012
1020
1032
1042

[2,2,2,2,1,2,2,0,0,2,2,2,0,2,2,2,1,2,2,1,2,2,0,0,
 1,0,0,2,2,2,0,1,1,0,2,2,2,1,2,1,2,1,2,1,2,2,0,0,0,
 0,0,0,0,0,2,2,2,0,0,0,0,0,0,0,2,2,2,1,2,0,0,0,0,0,
 0,2,1,2,2,0,0,2,0,0,0,0,0,2,0,0,2,2,2,0,2,2,0,0,0,
 0,2,2,0,2,2]