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A068711 as a simple table

na(n)
10
20
36
424
580
6272
7896
83584
915360
1065280
11270336
121081344
134259840
1416781312
1566584576
16266338304
171069547520
184294901760
1917213423616
2068853694464
21275146342400
221099512676352
234395899027456
2417583596109824
2570351564308480
26281474959933440

[0,0,6,24,80,272,896,3584,15360,65280,270336,
 1081344,4259840,16781312,66584576,266338304,
 1069547520,4294901760,17213423616,68853694464,
 275146342400,1099512676352,4395899027456,
 17583596109824,70351564308480,281474959933440]