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A289709 as a simple table

na(n)
12
24
310
428
584
6272
7946
83486
913560
1055432
11236852
121054928
134881972
1423420436
15116204016
16595246848
173142169416
1817068245184
1995267426432
20545732236936
213204607199704

[2,4,10,28,84,272,946,3486,13560,55432,236852,
 1054928,4881972,23420436,116204016,595246848,
 3142169416,17068245184,95267426432,545732236936,
 3204607199704]