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A203575 as a simple table

na(n)
10
21
34
42
57
68
73
86
99
1012
115
1210
1315
1416
1511
1614
1717
1820
1913
2018
2123
2224
2319
2422
2525
2628
2721
2826
2931
3032
3127
3230
3333
3436
3529
3634
3739
3840
3935
4038
4141
4244
4337
4442
4547
4648
4743
4846

[0,1,4,2,7,8,3,6,9,12,5,10,15,16,11,14,17,20,13,
 18,23,24,19,22,25,28,21,26,31,32,27,30,33,36,29,
 34,39,40,35,38,41,44,37,42,47,48,43,46]