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A231200 as a simple table

na(n)
00
12
28
324
472
5240
6924
74116
820944
9119952
10763540
115346748
1240845816
13338041704
143012855356
1528770647220
16293055401888
173171602665696
1836343889387172
19439607533130732
205597256953340360
2174829813397495128
221048039052970587788
2315345654816688856484

[0,2,8,24,72,240,924,4116,20944,119952,763540,
 5346748,40845816,338041704,3012855356,28770647220,
 293055401888,3171602665696,36343889387172,
 439607533130732,5597256953340360,
 74829813397495128,1048039052970587788,
 15345654816688856484]