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A024023 as a simple table

na(n)
00
12
28
326
480
5242
6728
72186
86560
919682
1059048
11177146
12531440
131594322
144782968
1514348906
1643046720
17129140162
18387420488
191162261466
203486784400
2110460353202
2231381059608
2394143178826
24282429536480
25847288609442
262541865828328
277625597484986
2822876792454960

[0,2,8,26,80,242,728,2186,6560,19682,59048,177146,
 531440,1594322,4782968,14348906,43046720,
 129140162,387420488,1162261466,3486784400,
 10460353202,31381059608,94143178826,282429536480,
 847288609442,2541865828328,7625597484986,
 22876792454960]