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A007915 as a simple table

na(n)
11
22
33
44
55
66
77
89
910
1011
1112
1213
1314
1415
1517
1618
1719
1820
1921
2022
2123
2225
2326
2428
2529
2630
2731
2833

[1,2,3,4,5,6,7,9,10,11,12,13,14,15,17,18,19,20,21,
 22,23,25,26,28,29,30,31,33]