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A012427 as a simple table

na(n)
02
1-12
2-50
312936
4-885062
519509820
68446530118
7-2256645131888
8271169972750322
952894208663673604
10-48060787092036123330
1116320006114052519358744
12-62047368403218100000854

[2,-12,-50,12936,-885062,19509820,8446530118,
 -2256645131888,271169972750322,52894208663673604,
 -48060787092036123330,16320006114052519358744,
 -62047368403218100000854]