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A078973 as a simple table

na(n)
12
26
336
4420
59800
6452760
741835024
87691667984
92828336198688
102073619375892064
113040584296923128384
128898500292240756664896
1352084270468105185237918848
14608812309050346291991694422400

[2,6,36,420,9800,452760,41835024,7691667984,
 2828336198688,2073619375892064,
 3040584296923128384,8898500292240756664896,
 52084270468105185237918848,
 608812309050346291991694422400]