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A007681 as a simple table

n a(n)
0 1
1 9
2 50
3 294
4 1944
5 14520
6 121680
7 1134000
8 11652480
9 130999680
10 1600300800
11 21115987200
12 299376000000
13 4539498163200
14 73316942899200
15 1256675067648000
16 22784918188032000
17 435717099417600000

[1,9,50,294,1944,14520,121680,1134000,11652480,
 130999680,1600300800,21115987200,299376000000,
 4539498163200,73316942899200,1256675067648000,
 22784918188032000,435717099417600000]

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Last modified February 21 03:06 EST 2019. Contains 320364 sequences. (Running on oeis4.)