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A068495 as a simple table

na(n)
16
256
3260
4780
5992
61976
72156
83696
95520
1013800
1116256
1219872
1322560
1423688
1525232
1641072
1787000
1889964
19133984
20145888
21366720
22785808
23851760
241100864
251235052
261270208
271439552
281470720
292129400
302237888
314729664
328690112

[6,56,260,780,992,1976,2156,3696,5520,13800,16256,
 19872,22560,23688,25232,41072,87000,89964,133984,
 145888,366720,785808,851760,1100864,1235052,
 1270208,1439552,1470720,2129400,2237888,4729664,
 8690112]