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A245355 as a simple table

na(n)
00
11
22
33
44
55
66
77
85
96
107
118
129
1310
1411
1512
167
178
189
1910
2011
2112
2213
2314
2412
2513
2614
2715
2816
2917
3018
3119
3211
3312
3413
3514
3615
3716
3817
3918
4013
4114
4215
4316
4417
4518
4619
4720
4818
4919
5020
5121
5222
5323
5424
5525
5614
5715
5816
5917
6018
6119
6220
6321
6413
6514
6615
6716
6817

[0,1,2,3,4,5,6,7,5,6,7,8,9,10,11,12,7,8,9,10,11,
 12,13,14,12,13,14,15,16,17,18,19,11,12,13,14,15,
 16,17,18,13,14,15,16,17,18,19,20,18,19,20,21,22,
 23,24,25,14,15,16,17,18,19,20,21,13,14,15,16,17]