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A218034 as a simple table

na(n)
01
14
212
324
484
5240
6732
72184
86564
919680
1059052
11177144
12531444
131594320
144782972
1514348904
1643046724
17129140160
18387420492
191162261464
203486784404
2110460353200
2231381059612
2394143178824
24282429536484
25847288609440
262541865828332
277625597484984
2822876792454964

[1,4,12,24,84,240,732,2184,6564,19680,59052,
 177144,531444,1594320,4782972,14348904,43046724,
 129140160,387420492,1162261464,3486784404,
 10460353200,31381059612,94143178824,282429536484,
 847288609440,2541865828332,7625597484984,
 22876792454964]