A212671 - OEIS

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A212671 as a simple table

n	a(n)
0	1
1	2
2	1
3	2
4	6
5	720
6	362880
7	6402373705728000
8	265252859812191058636308480000000
9	710998587804863451854045647463724949736497978881168458687447040000000000000

[1,2,1,2,6,720,362880,6402373705728000, 265252859812191058636308480000000, 71099858780486345185404564746372494973649797888116\ 8458687447040000000000000]