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A012999 as a simple table

na(n)
02
18
2328
331712
46354304
52085514752
61027652193280
7707087567055872
8648127370395910144
9763186372089893650432
101122739235799995992047616
112017897729638659884887834624
124350781970507936954099174998016

[2,8,328,31712,6354304,2085514752,1027652193280,
 707087567055872,648127370395910144,
 763186372089893650432,1122739235799995992047616,
 2017897729638659884887834624,
 4350781970507936954099174998016]