A013440 - OEIS

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A013440 as a simple table

n	a(n)
0	1
1	0
2	0
3	4
4	0
5	-8
6	160
7	992
8	-1792
9	-14464
10	484224
11	3391232
12	-30840832
13	-175044608
14	7718963200
15	53080130560
16	-1315838558208
17	-6862446264320
18	426971596029952
19	2514483259473920
20	-136067874243248128

[1,0,0,4,0,-8,160,992,-1792,-14464,484224,3391232, -30840832,-175044608,7718963200,53080130560, -1315838558208,-6862446264320,426971596029952, 2514483259473920,-136067874243248128]