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A081253 as a simple table

na(n)
12
24
39
418
537
674
7149
8298
9597
101194
112389
124778
139557
1419114
1538229
1676458
17152917
18305834
19611669
201223338
212446677
224893354
239786709
2419573418
2539146837
2678293674
27156587349
28313174698
29626349397
301252698794
312505397589

[2,4,9,18,37,74,149,298,597,1194,2389,4778,9557,
 19114,38229,76458,152917,305834,611669,1223338,
 2446677,4893354,9786709,19573418,39146837,
 78293674,156587349,313174698,626349397,1252698794,
 2505397589]