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”).

A230204 as a simple table

na(n)
01
1-2
20
31
40
51
6-2
72
80
90
100
110
12-2
130
14-1
15-2
162
170
183
190
200
212
222
23-2
240
25-2
260
27-2
28-2
290
300
310
320
331
340
350
362
372
380
391
40-2
412
42-2
430
440
450
460
470
48-2
490
502
510
52-2
530
540
552
560
570
58-2
590
601
61-2
620
63-2
642
650
660
670
681
690
700
710
722
730
740
752
762
77-2
782
790
800

[1,-2,0,1,0,1,-2,2,0,0,0,0,-2,0,-1,-2,2,0,3,0,0,2,
 2,-2,0,-2,0,-2,-2,0,0,0,0,1,0,0,2,2,0,1,-2,2,-2,0,
 0,0,0,0,-2,0,2,0,-2,0,0,2,0,0,-2,0,1,-2,0,-2,2,0,
 0,0,1,0,0,0,2,0,0,2,2,-2,2,0,0]