A268760 - OEIS

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A268760 as a simple table

n	a(n)
1	0
2	6
3	56
4	1148
5	32056
6	1552272
7	127676872
8	18045771274
9	4495138018796
10	1955829240647962
11	1511334747222697904
12	2064152526111916503300
13	5022957354228609008158500
14	21748481726801956896608976098

[0,6,56,1148,32056,1552272,127676872,18045771274, 4495138018796,1955829240647962, 1511334747222697904,2064152526111916503300, 5022957354228609008158500, 21748481726801956896608976098]