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A066278 as a simple table

na(n)
12
24
310
436
5168
61008
77056
856448
9470400
104704000
1151528960
12618347520
137740902400
14108372633600

[2,4,10,36,168,1008,7056,56448,470400,4704000,
 51528960,618347520,7740902400,108372633600]