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A007508 as a simple table

na(n)
12
28
335
4205
51224
68169
758980
8440312
93424506
1027412679
11224376048
121870585220
1315834664872
14135780321665
151177209242304
1610304195697298
1790948839353159
18808675888577436

[2,8,35,205,1224,8169,58980,440312,3424506,
 27412679,224376048,1870585220,15834664872,
 135780321665,1177209242304,10304195697298,
 90948839353159,808675888577436]