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A080240 as a simple table

na(n)
00
11
22
34
45
56
68
79
810
911
1012
1114
1215
1316
1417
1518
1619
1720
1821
1922
2023
2124
2225
2326
2428
2529
2630
2731
2832
2933
3034
3135
3236
3337
3438
3539
3640
3741
3842
3943
4044
4145
4246
4347
4448
4549
4650
4751
4852
4953
5054
5156
5257
5358
5459
5560
5661
5762
5863
5964
6065
6166
6267
6368
6469
6570
6671
6772
6873
6974
7075
7176

[0,1,2,4,5,6,8,9,10,11,12,14,15,16,17,18,19,20,21,
 22,23,24,25,26,28,29,30,31,32,33,34,35,36,37,38,
 39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,
 56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,
 72,73,74,75,76]