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A015407 as a simple table

na(n)
111
12-132860
1326477735830
14-4522934399547980
15811239619864365082573
16-143119691677080990521708240
1725388050075285266699527263288120
18-4495361402895546052989488899628855120

[1,-132860,26477735830,-4522934399547980,
 811239619864365082573,
 -143119691677080990521708240,
 25388050075285266699527263288120,
 -4495361402895546052989488899628855120]