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A012818 as a simple table

na(n)
01
16
2140
38456
4957840
5174293856
646514037440
717115342333056
88304761365213440
95137820023434733056
103947233200665413667840
113686931444647916864505856
124114664615209642258282352640

[1,6,140,8456,957840,174293856,46514037440,
 17115342333056,8304761365213440,
 5137820023434733056,3947233200665413667840,
 3686931444647916864505856,
 4114664615209642258282352640]