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A009140 as a simple table

na(n)
01
10
20
30
412
5-120
61020
7-8820
882908
9-867888
1010145760
11-131406000
121864232832
13-28656815616
14473108471472
15-8332064722800
16155724385537488
17-3076215029701248
1864018830395437056
19-1399676595110345088

[1,0,0,0,12,-120,1020,-8820,82908,-867888,
 10145760,-131406000,1864232832,-28656815616,
 473108471472,-8332064722800,155724385537488,
 -3076215029701248,64018830395437056,
 -1399676595110345088]