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A032981 as a simple table

na(n)
11
22
33
44
55
66
77
88
99
1010
1111
1212
1321
1422
1523
1632
1733
1834
1943
2044
2145
2254
2355
2456
2565
2666
2767
2876
2977
3078
3187
3288
3389
3498
3599
36100
37101
38110
39111
40112
41121
42122
43123
44210
45211
46212
47221
48222
49223
50232
51233
52234
53321
54322
55323
56332
57333
58334
59343
60344
61345

[1,2,3,4,5,6,7,8,9,10,11,12,21,22,23,32,33,34,43,
 44,45,54,55,56,65,66,67,76,77,78,87,88,89,98,99,
 100,101,110,111,112,121,122,123,210,211,212,221,
 222,223,232,233,234,321,322,323,332,333,334,343,
 344,345]