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A027617 as a simple table

n a(n)
0 0
1 0
2 0
3 2
4 8
5 40
6 200
7 1400
8 11200
9 103040
10 1030400
11 11334400
12 135766400
13 1764963200
14 24709484800
15 370687116800
16 5930993868800
17 100826895769600
18 1814871926067200
19 34482566595276800
20 689651331905536000
21 14482682605174784000
22 318619017313845248000

[0,0,0,2,8,40,200,1400,11200,103040,1030400,
 11334400,135766400,1764963200,24709484800,
 370687116800,5930993868800,100826895769600,
 1814871926067200,34482566595276800,
 689651331905536000,14482682605174784000,
 318619017313845248000]

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Last modified March 29 07:27 EDT 2024. Contains 371265 sequences. (Running on oeis4.)