cp's OEIS Frontend

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.

Showing 1-2 of 2 results.

A345216 Number of simple graphs on n nodes with no cycle of length 5.

Original entry on oeis.org

1, 2, 4, 11, 26, 80, 251, 929, 3727, 17565, 95428, 629795, 5171063, 55857762, 831428458, 17625946914
Offset: 1

Views

Author

Brendan McKay, Jun 10 2021

Keywords

Comments

EULER transformation of A241784.

Crossrefs

Cf. A241784.

A243246 Number of unlabeled, connected graphs on n vertices with at least one subgraph isomorphic to a C_5, where C_5 is the cycle graph on five vertices.

Original entry on oeis.org

0, 0, 0, 0, 8, 68, 709, 10540, 258623, 11704072, 1006628171, 164059321534, 50335903460830, 29003487412989468
Offset: 1

Views

Author

Travis Hoppe and Anna Petrone, Jun 01 2014

Keywords

Links

Crossrefs

Cf. A001349, A241784.

Formula

a(n) = A001349(n) - A241784(n).

Extensions

a(11)-a(14) from formula by Falk Hüffner, Sep 22 2020
Showing 1-2 of 2 results.

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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