login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo

Please make a donation to keep the OEIS running. We are now in our 56th year. In the past year we added 10000 new sequences and reached almost 9000 citations (which often say "discovered thanks to the OEIS").
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A087114 Number of regular bipartite simple graphs on n nodes. 1
1, 2, 1, 3, 1, 4, 1, 6, 1, 8, 1, 18, 1, 40, 1, 230, 1, 4296, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

A graph must be regular and bipartite to be a semisymmetric graph.

LINKS

Table of n, a(n) for n=1..19.

Eric Weisstein's World of Mathematics, Semisymmetric Graph

FORMULA

a(2*n + 1) = 1, a(2*n) = A008324(n). - Andrew Howroyd, Sep 05 2018

CROSSREFS

Cf. A008323, A008324, A008327.

Sequence in context: A337377 A308059 A319698 * A303753 A088242 A228814

Adjacent sequences:  A087111 A087112 A087113 * A087115 A087116 A087117

KEYWORD

nonn,more

AUTHOR

Eric W. Weisstein, Aug 13 2003

EXTENSIONS

a(10)-a(19) from Andrew Howroyd, Sep 05 2018

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified November 26 12:37 EST 2020. Contains 338639 sequences. (Running on oeis4.)