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A337020 as a simple table

na(n)
10
21
31
42
53
64
74
85
95
106
118
129
139
149
1510
1611
1712
1813
1913
2015
2116
2216
2316
2418
2518
2620
2720
2821
2922
3022
3124
3225
3325
3425
3527
3627
3728
3830
3930

[0,1,1,2,3,4,4,5,5,6,8,9,9,9,10,11,12,13,13,15,16,
 16,16,18,18,20,20,21,22,22,24,25,25,25,27,27,28,
 30,30]