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A305545 as a simple table

n a(n)
1 0
2 0
3 0
4 0
5 0
6 60
7 1080
8 11970
9 105840
10 821592
11 5873760
12 39705630
13 258121080
14 1631169900
15 10096542792
16 61535329380
17 370709045280
18 2213740488600
19 13132064237040
20 77509384111278
21 455754440462040
22 2672268921657540
23 15636049474529880
24 91353538645037220
25 533180401444362672

[0,0,0,0,0,60,1080,11970,105840,821592,5873760,
 39705630,258121080,1631169900,10096542792,
 61535329380,370709045280,2213740488600,
 13132064237040,77509384111278,455754440462040,
 2672268921657540,15636049474529880,
 91353538645037220,533180401444362672]

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Last modified October 1 04:06 EDT 2020. Contains 337441 sequences. (Running on oeis4.)