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A007906 as a simple table

na(n)
11
22
32
43
52
6-1
72
83
94
104
112
127
132
145
155
166
172
184
192
207
213
226
232
245
25-1
267
273
28-1
292
3015
312
323
336
348
353
364
372
387
393
404
412
4214
432
445
457
468
472
486
494
503
514
529
532
5413
553
565
573
584
592
6011
612
629
633
644
653
6612
672
685
694
706
712
729
732
745
755
765
773
7811
792
807
815
826
832
846
853
869
877
887
892
9010
914
926
934
944
95-1
969
972
983

[1,2,2,3,2,-1,2,3,4,4,2,7,2,5,5,6,2,4,2,7,3,6,2,5,
 -1,7,3,-1,2,15,2,3,6,8,3,4,2,7,3,4,2,14,2,5,7,8,2,
 6,4,3,4,9,2,13,3,5,3,4,2,11,2,9,3,4,3,12,2,5,4,6,
 2,9,2,5,5,5,3,11,2,7,5,6,2,6,3,9,7,7,2,10,4,6,4,4,
 -1,9,2,3]