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A199939 as a simple table

na(n)
18
256
3376
42474
516114
6104268
7672866
84334232
927893374
10179433990
111154022716
127420994944
1347717937374

[8,56,376,2474,16114,104268,672866,4334232,
 27893374,179433990,1154022716,7420994944,
 47717937374]