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A138964 as a simple table

na(n)
00
12
228
380
4208
51664
628864
7137600
81660672
93207680
1045816832
11245602304
121239224320
131206665216
149653321728
15390683230208
162185095872512
17554107535360
1838286179172352
19306289433378816
201231595987009536
219852767896076288
2278822143168610304
23367333737664348160

[0,2,28,80,208,1664,28864,137600,1660672,3207680,
 45816832,245602304,1239224320,1206665216,
 9653321728,390683230208,2185095872512,
 554107535360,38286179172352,306289433378816,
 1231595987009536,9852767896076288,
 78822143168610304,367333737664348160]