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A007981 as a simple table

na(n)
10
20
30
40
50
60
70
81
92
104
116
1210
1313
1419
1524
1632
1739
1850
1959
2073
2185
22102
23117
24138
25156
26181
27203
28232
29258
30292
31322
32361
33396
34440
35480
36530
37575
38631
39682
40744
41801
42870
43933
441009
451079
461162
471239
481330
491414
501513
511605
521712
531812
541928
552036
562161

[0,0,0,0,0,0,0,1,2,4,6,10,13,19,24,32,39,50,59,73,
 85,102,117,138,156,181,203,232,258,292,322,361,
 396,440,480,530,575,631,682,744,801,870,933,1009,
 1079,1162,1239,1330,1414,1513,1605,1712,1812,1928,
 2036,2161]