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A158987 as a simple table

na(n)
01
16
2-62
3-1548
48940
5660456
6-417864
7-390855312
8-2058477168
9294079701600
103580055071776
11-266717777137344
12-5459606030198592
13280902469732324992
148640952900866956160
15-333552471067548152064
16-14703515590679714467584
17434789181089837215630848

[1,6,-62,-1548,8940,660456,-417864,-390855312,
 -2058477168,294079701600,3580055071776,
 -266717777137344,-5459606030198592,
 280902469732324992,8640952900866956160,
 -333552471067548152064,-14703515590679714467584,
 434789181089837215630848]