A259056 - OEIS

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A259056 as a simple table

n	a(n)
1	1
2	-3
3	-16
4	60
5	384
6	-1680
7	-12288
8	60480
9	491520
10	-2661120
11	-23592960
12	138378240
13	1321205760
14	-8302694400
15	-84557168640
16	564583219200
17	6088116142080
18	-42908324659200
19	-487049291366400
20	3604299271372800

[1,-3,-16,60,384,-1680,-12288,60480,491520, -2661120,-23592960,138378240,1321205760, -8302694400,-84557168640,564583219200, 6088116142080,-42908324659200,-487049291366400, 3604299271372800]