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A120665 as a simple table

n a(n)
1 0
2 -1
3 0
4 9
5 52
6 231
7 936
8 3641
9 13884
10 52407
11 196768
12 736713
13 2754180
14 10288199
15 38415000
16 143404569
17 535268812
18 1997801751
19 7456200336
20 27827523881
21 103854943764
22 387594348327
23 1446526643848
24 5398520615673
25 20147572596060
26 75191803322999
27 280619707804800

[0,-1,0,9,52,231,936,3641,13884,52407,196768,
 736713,2754180,10288199,38415000,143404569,
 535268812,1997801751,7456200336,27827523881,
 103854943764,387594348327,1446526643848,
 5398520615673,20147572596060,75191803322999,
 280619707804800]

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Last modified July 12 11:11 EDT 2020. Contains 335658 sequences. (Running on oeis4.)