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A064660 as a simple table

na(n)
11
21
32
43
54
66
78
811
915
1022
1130
1239
1353
1475
15106
16151
17215
18297
19424
20592
21835
221162
231618
242274
253217
264556
276361
288940
2912560
3017645
3124822
3234812
3348967
3468861
3596939
36136462
37191896
38269976
39379726
40534239
41751829
421058170
431489038
442096243
452951262

[1,1,2,3,4,6,8,11,15,22,30,39,53,75,106,151,215,
 297,424,592,835,1162,1618,2274,3217,4556,6361,
 8940,12560,17645,24822,34812,48967,68861,96939,
 136462,191896,269976,379726,534239,751829,1058170,
 1489038,2096243,2951262]