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A218602 as a simple table

na(n)
00
11
22
34
43
57
66
75
812
911
1010
119
128
1321
1420
1519
1618
1717
1816
1915
2014
2113
2238
2337
2436
2535
2634
2733
2832
2931
3030
3129
3228
3327
3426
3525
3624
3723
3822
3968
4067
4166
4265
4364
4463
4562
4661
4760
4859
4958
5057
5156
5255
5354
5453
5552
5651
5750
5849
5948
6047
6146
6245
6344
6443
6542
6641
6740
6839

[0,1,2,4,3,7,6,5,12,11,10,9,8,21,20,19,18,17,16,
 15,14,13,38,37,36,35,34,33,32,31,30,29,28,27,26,
 25,24,23,22,68,67,66,65,64,63,62,61,60,59,58,57,
 56,55,54,53,52,51,50,49,48,47,46,45,44,43,42,41,
 40,39]