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A028985 as a simple table

na(n)
12
28
3242
420402
524642
62004002
72138312
82468642
985099058
10200040002
11204060402
12242484242
13291080192
1420000400002
1520442824402
1624204840242
1729956665992
1888484148488
19297738837792
202000004000002
212004006004002
222040608060402
232420048400242

[2,8,242,20402,24642,2004002,2138312,2468642,
 85099058,200040002,204060402,242484242,291080192,
 20000400002,20442824402,24204840242,29956665992,
 88484148488,297738837792,2000004000002,
 2004006004002,2040608060402,2420048400242]