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A180890 as a simple table

n a(n)
1 1
2 0
3 2
4 6
5 20
6 90
7 550
8 3512
9 25378
10 200558
11 1778156
12 17016488
13 177741892
14 1984308356
15 23873823014
16 304944376412
17 4155112842840 

[1,0,2,6,20,90,550,3512,25378,200558,1778156,
 17016488,177741892,1984308356,23873823014,
 304944376412,4155112842840]

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Last modified April 24 00:30 EDT 2024. Contains 371917 sequences. (Running on oeis4.)