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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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A130623 Number of polyhexes with perimeter at most 2n.

Original entry on oeis.org

0, 0, 1, 1, 2, 3, 6, 8, 20, 34, 84, 182
Offset: 1

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Author

Tanya Khovanova, Aug 11 2007

Keywords

Comments

The perimeter of a polyhex is always even.
Partial sums of A057779.
a(2n+1) >= A131467(n).

Crossrefs

Cf. A038142 (planar cata-polyhexes with n cells).
Cf. A057779 (hexagonal polyominoes with perimeter 2n).
Cf. A131467 (planar polyhexes with at most n cells).

Extensions

Offset corrected by John Mason, Jan 16 2023
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