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A012342 as a simple table

na(n)
00
12
28
3368
418048
51827072
6253363200
750403563520
813158813696000
94414765984972800
101841972633056051200
11936689336904269168640
12569861032837432328847360
13408713488929007199437455360

[0,2,8,368,18048,1827072,253363200,50403563520,
 13158813696000,4414765984972800,
 1841972633056051200,936689336904269168640,
 569861032837432328847360,
 408713488929007199437455360]