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A031975 as a simple table

na(n)
11
22
33
45
56
67
78
810
911
1011
1113
1214
1315
1416
1517
1619
1721
1822
1923
2024
2126
2227
2329
2430
2531
2633
2734
2835
2937
3038
3139
3241
3342
3443
3545
3647
3748
3850
3953

[1,2,3,5,6,7,8,10,11,11,13,14,15,16,17,19,21,22,
 23,24,26,27,29,30,31,33,34,35,37,38,39,41,42,43,
 45,47,48,50,53]