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A077611 as a simple table

na(n)
10
20
34
412
5144
6720
78640
860480
9806400
107257600
11108864000
121197504000
1320118067200
14261534873600
154881984307200
1673229764608000
171506440871936000
1825609494822912000
19576213633515520000
2010948059036794880000
21267619220899430400000
225620003638888038400000

[0,0,4,12,144,720,8640,60480,806400,7257600,
 108864000,1197504000,20118067200,261534873600,
 4881984307200,73229764608000,1506440871936000,
 25609494822912000,576213633515520000,
 10948059036794880000,267619220899430400000,
 5620003638888038400000]