A047660 - OEIS

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A047660 as a simple table

n	a(n)
1	1
2	1
3	0
4	1
5	2
6	40
7	0
8	703760
9	131328
10	300241541128192
11	0
12	28170013344558609991874248704
13	24595658799308603392
14	9502080486519653717758562294813775233459455787008
15	0

[1,1,0,1,2,40,0,703760,131328,300241541128192,0, 28170013344558609991874248704, 24595658799308603392, 9502080486519653717758562294813775233459455787008, 0]