Statements (27)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
integer sequence
|
| gptkbp:author |
gptkb:N._J._A._Sloane
|
| gptkbp:describedBy |
gptkb:OEIS
|
| gptkbp:field |
graph theory
|
| gptkbp:form |
a(n) = sum_{k=1..n} (-1)^(k+1) * binomial(n-1, k-1) * 2^(k*(n-k)) * a(n-k)
|
| gptkbp:hasKeyword |
easy
nice nonn |
| https://www.w3.org/2000/01/rdf-schema#label |
A006842
|
| gptkbp:name |
Number of connected labeled graphs with n nodes
|
| gptkbp:OEIS |
gptkb:A006842
|
| gptkbp:relatedTo |
A001187
A001349 |
| gptkbp:sequence |
1
38 4 728 1866256 251548592 26704 66296291072 299043407112805998161920 34496488594848 35641657583718400 73068594072691527680 |
| gptkbp:bfsParent |
gptkb:Farey_sequence
|
| gptkbp:bfsLayer |
6
|