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A007027 as a simple table

n a(n)
4 1
5 0
6 1
7 1
8 4
9 10
10 53
11 292
12 2224
13 18493
14 167504
15 1571020
16 15151289
17 148864939
18 1485904672
19 15028654628
20 153781899708
21 1589921572902
22 16591187039082 

[1,0,1,1,4,10,53,292,2224,18493,167504,1571020,
 15151289,148864939,1485904672,15028654628,
 153781899708,1589921572902,16591187039082]

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Last modified April 23 20:33 EDT 2024. Contains 371916 sequences. (Running on oeis4.)