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A307731 as a simple table

na(n)
00
11
26
33
48
52
611
74
89
95
1015
117
1219
1314
1410
1516
1617
1718
1812
1920
2013
2126
2227
2328
2425
2521
2622
2723
2824
2938
3031
3140
3233
3342
3435
3544
3629
3730
3851
3932
4053
4134
4255
4336
4449
4557
4658
4759
4860
4962
5039
5164
5241
5366
5443
5568
5637
5746
5847
5948
6045
6150
6263
6352
6465
6554
6667

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