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.

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A289709 Number of independent vertex sets and vertex covers in the n-triangular honeycomb queen graph.

Original entry on oeis.org

2, 4, 10, 28, 84, 272, 946, 3486, 13560, 55432, 236852, 1054928, 4881972, 23420436, 116204016, 595246848, 3142169416, 17068245184, 95267426432, 545732236936, 3204607199704
Offset: 1

Views

Author

Eric W. Weisstein, Jul 14 2017

Keywords

Links

Crossrefs

Cf. A193986, A283117, A289883, A289893, A326611.

Formula

From Andrew Howroyd, Sep 12 2019: (Start)
a(n) = 6*A283117(n) - 2*A326611(n) - 3*2^ceiling(n/2).
a(n) = 1 + Sum_{k>=1} A193986(n,k).
(End)

Extensions

a(13)-a(21) from Andrew Howroyd, Sep 12 2019
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Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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