A006005

GPTKB entity

Statements (28)
Predicate Object
gptkbp:instanceOf integer sequence
gptkbp:author gptkb:N._J._A._Sloane
gptkbp:citation A001187
A000088
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 A006005
gptkbp:name Number of connected labeled graphs with n nodes
gptkbp:OEIS gptkb:A006005
gptkbp:offset 1
gptkbp:relatedTo A001187
A000088
gptkbp:sequence 1
38
4
728
1866256
251548592
26704
66296291072
34496488594848
35641657583720576
gptkbp:bfsParent gptkb:OEIS_A006005
gptkbp:bfsLayer 8