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A231551 as a simple table

na(n)
00
11
22
33
44
57
66
75
88
915
1014
119
1212
1311
1410
1513
1616
1731
1830
1917
2028
2119
2218
2329
2424
2523
2622
2725
2820
2927
3026
3121
3232
3363
3462
3533
3660
3735
3834
3961
4056
4139
4238
4357
4436
4559
4658
4737
4848
4947
5046
5149
5244
5351
5450
5545
5640
5755
5854
5941
6052
6143
6242
6353
6464
65127
66126
6765

[0,1,2,3,4,7,6,5,8,15,14,9,12,11,10,13,16,31,30,
 17,28,19,18,29,24,23,22,25,20,27,26,21,32,63,62,
 33,60,35,34,61,56,39,38,57,36,59,58,37,48,47,46,
 49,44,51,50,45,40,55,54,41,52,43,42,53,64,127,126,
 65]