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A000588 as a simple table

n a(n)
0 0
1 0
2 0
3 1
4 7
5 35
6 154
7 637
8 2548
9 9996
10 38760
11 149226
12 572033
13 2187185
14 8351070
15 31865925
16 121580760
17 463991880
18 1771605360
19 6768687870
20 25880277150
21 99035193894
22 379300783092
23 1453986335186
24 5578559816632
25 21422369201800
26 82336410323440
27 316729578421620

[0,0,0,1,7,35,154,637,2548,9996,38760,149226,
 572033,2187185,8351070,31865925,121580760,
 463991880,1771605360,6768687870,25880277150,
 99035193894,379300783092,1453986335186,
 5578559816632,21422369201800,82336410323440,
 316729578421620]

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Last modified February 25 12:46 EST 2018. Contains 299654 sequences. (Running on oeis4.)