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A263580 as a simple table

na(n)
00
11
25
312
413
515
617
718
819
921
1023
1124
1225
1326
1428
1529
1630
1731
1832
1933
2035
2136
2237
2338
2439
2540
2641
2742
2843
2944
3045
3146
3247
3348
3449
3550
3651
3752
3853
3954
4055
4156
4257
4358
4459
4560
4661
4762
4863
4964
5065
5167
5268
5369
5470
5571
5672
5773
5874
5975
6076
6177
6278
6379
6480

[0,1,5,12,13,15,17,18,19,21,23,24,25,26,28,29,30,
 31,32,33,35,36,37,38,39,40,41,42,43,44,45,46,47,
 48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,
 64,65,67,68,69,70,71,72,73,74,75,76,77,78,79,80]