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A007091 as a simple table

na(n)
00
11
22
33
44
510
611
712
813
914
1020
1121
1222
1323
1424
1530
1631
1732
1833
1934
2040
2141
2242
2343
2444
25100
26101
27102
28103
29104
30110
31111
32112
33113
34114
35120
36121
37122
38123
39124
40130
41131
42132
43133
44134
45140
46141
47142
48143
49144
50200
51201
52202
53203
54204
55210
56211
57212
58213
59214
60220
61221
62222
63223
64224
65230

[0,1,2,3,4,10,11,12,13,14,20,21,22,23,24,30,31,32,
 33,34,40,41,42,43,44,100,101,102,103,104,110,111,
 112,113,114,120,121,122,123,124,130,131,132,133,
 134,140,141,142,143,144,200,201,202,203,204,210,
 211,212,213,214,220,221,222,223,224,230]