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A248958 as a simple table

na(n)
10
21
31
42
52
63
73
84
95
106
117
127
138
149
1510
1611
1712
1812
1913
2013
2114
2215
2316
2417
2518
2619
2720
2820
2921
3022
3123
3223
3324
3425

[0,1,1,2,2,3,3,4,5,6,7,7,8,9,10,11,12,12,13,13,14,
 15,16,17,18,19,20,20,21,22,23,23,24,25]