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A304069 as a simple table

n a(n)
1 0
2 1
3 4
4 20
5 120
6 996
7 12208
8 241520
9 8171936
10 491317640
11 53489987584
12 10642774095040
13 3891541970165760
14 2627082058057474240
15 3288629181834544457216
16 7666328470407977450185984
17 33415367571344085375628748800
18 273361007807597539567353971109952

[0,1,4,20,120,996,12208,241520,8171936,491317640,
 53489987584,10642774095040,3891541970165760,
 2627082058057474240,3288629181834544457216,
 7666328470407977450185984,
 33415367571344085375628748800,
 273361007807597539567353971109952]

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Last modified March 24 06:56 EDT 2019. Contains 321444 sequences. (Running on oeis4.)