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A068777 as a simple table

na(n)
10
22
36
424
580
6240
7896
83584
915360
1065792
11270336
121081344
134259840
1416773120
1566584576
16266338304
171069547520
184295032832
1917213423616
2068853694464
21275146342400
221099510579200
234395899027456
2417583596109824
2570351564308480
26281474993487872

[0,2,6,24,80,240,896,3584,15360,65792,270336,
 1081344,4259840,16773120,66584576,266338304,
 1069547520,4295032832,17213423616,68853694464,
 275146342400,1099510579200,4395899027456,
 17583596109824,70351564308480,281474993487872]