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A137592 as a simple table

na(n)
01
12
248
334560
41393459200
55056584744960000
62422112183371431936000000
7211155601241022491077587763200000000
84417964278440225627098723475313498521600000000000

[1,2,48,34560,1393459200,5056584744960000,
 2422112183371431936000000,
 211155601241022491077587763200000000,
 4417964278440225627098723475313498521600000000000]