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A189398 as a simple table

na(n)
12
24
38
416
532
664
7128
8256
9512
102
116
1218
1354
14162
15486
161458
174374
1813122
1939366
204
2112
2236
23108
24324
25972
262916
278748
2826244
2978732
308
3124
3272
33216
34648
351944
365832
3717496
3852488
39157464
4016
4148
42144
43432
441296
453888
4611664
4734992
48104976
49314928
5032

[2,4,8,16,32,64,128,256,512,2,6,18,54,162,486,
 1458,4374,13122,39366,4,12,36,108,324,972,2916,
 8748,26244,78732,8,24,72,216,648,1944,5832,17496,
 52488,157464,16,48,144,432,1296,3888,11664,34992,
 104976,314928,32]