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A064688 as a simple table

na(n)
11
22
33
45
512
618
738
854
9104
10256
11340
12760
131260
141610
152590
165120
179792
1812076
1922250
2032992
2140026
2270488
23101698
24173682
25345856
26483330
27570078
28789640
29927406
301274118
313725410
325010688
337755776
348953856
3518108418
3620792120

[1,2,3,5,12,18,38,54,104,256,340,760,1260,1610,
 2590,5120,9792,12076,22250,32992,40026,70488,
 101698,173682,345856,483330,570078,789640,927406,
 1274118,3725410,5010688,7755776,8953856,18108418,
 20792120]