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A323442 as a simple table

na(n)
12
22
32
42
56
68
716
826
944
1088
11160
12318
13620
141234
152434
164860
179664
1819282
1938450
2076804
21153362
22306524
23612576
241224770
252448594
264896428
279790988
2819580486
2939157180
3078311372
31156615316
32313224766
33626434456
341252857082
352505684038
365011344512

[2,2,2,2,6,8,16,26,44,88,160,318,620,1234,2434,
 4860,9664,19282,38450,76804,153362,306524,612576,
 1224770,2448594,4896428,9790988,19580486,39157180,
 78311372,156615316,313224766,626434456,1252857082,
 2505684038,5011344512]