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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A331014 Number of unlabeled bicolored bipartite graphs on 2n nodes having n nodes of each color with no edges between vertices of the same color and edges having three colors and allowing the node color classes to be interchanged. Edge colors are swappable (permuted by the symmetric group).

Original entry on oeis.org

1, 6, 84, 7946, 5413511, 25231086540, 800871112032930, 177544715836044855636, 281653040526999655665449719, 3266495639384107667257990172349726, 282129919925994006382238965837655927175534, 184379837924757642947198903200667422197524750679153
Offset: 1

Views

Author

Marko Riedel, Jan 06 2020

Keywords

Comments

Color swaps of the node colors are reflections of the biclique about a vertical axis, with one part on the left and the other on the right. Edge colors are distinct from the two node colors.

References

  • E. Palmer and F. Harary, Graphical Enumeration, Academic Press, 1973.

Links

Crossrefs

Cf. A007139, A331013.
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Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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