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A222228 as a simple table

na(n)
00
11
24
33
42
55
66
77
88
99
1010
1111
1214
1313
1412
1515
1616
1717
1818
1919
2040
2141
2244
2343
2442
2545
2646
2747
2848
2949
3030
3131
3234
3333
3432
3535
3636
3737
3838
3939
4020
4121
4224
4323
4422
4525
4626
4727
4828
4929
5050
5151
5254
5353
5452
5555
5656
5757
5858
5959
6060
6161
6264
6363
6462
6565
6666

[0,1,4,3,2,5,6,7,8,9,10,11,14,13,12,15,16,17,18,
 19,40,41,44,43,42,45,46,47,48,49,30,31,34,33,32,
 35,36,37,38,39,20,21,24,23,22,25,26,27,28,29,50,
 51,54,53,52,55,56,57,58,59,60,61,64,63,62,65,66]