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A097618 as a simple table

na(n)
03
12
23
32
43
54
65
76
88
910
1013
1115
1218
1320
1422
1525
1629
1732
1833
1934
2037
2139
2241
2342
2444
2545

[3,2,3,2,3,4,5,6,8,10,13,15,18,20,22,25,29,32,33,
 34,37,39,41,42,44,45]