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A108012 as a simple table

na(n)
00
14
218
376
4320
51360
65832
725200
8109568
9478784
102100512
119244352
1240784896
13180284672
14798121088
153537391360
1615692333056
1769661541376
18309407486464
191374824795136
206110847909888
2127168232722432
22120809925167104

[0,4,18,76,320,1360,5832,25200,109568,478784,
 2100512,9244352,40784896,180284672,798121088,
 3537391360,15692333056,69661541376,309407486464,
 1374824795136,6110847909888,27168232722432,
 120809925167104]