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A045671 as a simple table

na(n)
00
11
22
33
45
56
67
79
810
911
1013
1114
1215
1316
1417
1519
1620
1721
1823
1924
2025
2127
2228
2329
2430
2531
2633
2734
2835
2937
3038
3139
3241
3342
3443
3544
3645
3747
3848
3949
4051
4152
4253
4355
4456
4557
4659
4760
4861
4963
5064
5165
5266
5367
5469
5570

[0,1,2,3,5,6,7,9,10,11,13,14,15,16,17,19,20,21,23,
 24,25,27,28,29,30,31,33,34,35,37,38,39,41,42,43,
 44,45,47,48,49,51,52,53,55,56,57,59,60,61,63,64,
 65,66,67,69,70]