A009990 - OEIS

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A009990 as a simple table

n	a(n)
0	1
1	46
2	2116
3	97336
4	4477456
5	205962976
6	9474296896
7	435817657216
8	20047612231936
9	922190162669056
10	42420747482776576
11	1951354384207722496
12	89762301673555234816
13	4129065876983540801536
14	189937030341242876870656

[1,46,2116,97336,4477456,205962976,9474296896, 435817657216,20047612231936,922190162669056, 42420747482776576,1951354384207722496, 89762301673555234816,4129065876983540801536, 189937030341242876870656]