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A203778 as a simple table

na(n)
12
2-48
340320
4-159667200
51743565824000
6-40548366802944000
71723467782592331776000
8-120987438337981690675200000
913052124847901464790040576000000
10-2050227771108362089219573678080000000
11449688758403823707201064412255354880000000

[2,-48,40320,-159667200,1743565824000,
 -40548366802944000,1723467782592331776000,
 -120987438337981690675200000,
 13052124847901464790040576000000,
 -2050227771108362089219573678080000000,
 449688758403823707201064412255354880000000]