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A245856 as a simple table

n a(n)
3 1
4 0
5 0
6 20
7 70
8 112
9 1848
10 12840
11 62700
12 591800
13 5484908
14 40589276
15 421291780
16 4704380800
17 46345716880
18 533446290384
19 6931113219780
20 85313661653400
21 1121432682942740
22 16310909250477380
23 237534778732260548
24 3578871132644512672
25 57980168196079811800

[1,0,0,20,70,112,1848,12840,62700,591800,5484908,
 40589276,421291780,4704380800,46345716880,
 533446290384,6931113219780,85313661653400,
 1121432682942740,16310909250477380,
 237534778732260548,3578871132644512672,
 57980168196079811800]

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Last modified April 24 11:14 EDT 2024. Contains 371936 sequences. (Running on oeis4.)