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A108209 as a simple table

na(n)
00
12
210
392
41320
525664
6628400
718544032
8640243520
925313036288
101127562249600
1155871851754240
123048145476992000
13181547804177418240
1411721355489130393600
15815411545722159841280
1660804225264488076288000

[0,2,10,92,1320,25664,628400,18544032,640243520,
 25313036288,1127562249600,55871851754240,
 3048145476992000,181547804177418240,
 11721355489130393600,815411545722159841280,
 60804225264488076288000]