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A136606 as a simple table

na(n)
11
26
324
45040
572576
639916800
795800320
81307674368000
94184557977600
10121645100408832000
112043637686868377600
1225852016738884976640000
13238634000666630553600000
1410888869450418352160768000000

[1,6,24,5040,72576,39916800,95800320,
 1307674368000,4184557977600,121645100408832000,
 2043637686868377600,25852016738884976640000,
 238634000666630553600000,
 10888869450418352160768000000]