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A259212 as a simple table

na(n)
10
20
30
46
572
61920
769120
83402000
9218252160
1017708544000
111773002649600
12214725759494400
1330941575378560000
145231894853375590400
151025881591718766182400
16230901375630648602880000
1759127083048250564931584000
1817091634972762948947148800000

[0,0,0,6,72,1920,69120,3402000,218252160,
 17708544000,1773002649600,214725759494400,
 30941575378560000,5231894853375590400,
 1025881591718766182400,230901375630648602880000,
 59127083048250564931584000,
 17091634972762948947148800000]