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A057712 Number of "polyhes" of order n: a polyhe of order n is obtained by taking a polyhex made of n hexagons (A000228); cutting each of the n hexagons along a diameter and throwing away half that hexagon, in such a way that the remaining figure (made of n half-hexagons) is connected. 1
1, 4, 13, 60, 276, 1416, 7201, 37972 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

REFERENCES

Enumeration attributed by Andrew Clarke to Brendan Owen.

LINKS

Table of n, a(n) for n=1..8.

Andrew Clarke, Polyhes

Picture from Andrew Clarke's page showing triangle formed by combining polyhes of orders 1, 2 and 3.

Eric Weisstein's World of Mathematics, Polyhe

CROSSREFS

Sequence in context: A219367 A149487 A320359 * A208592 A213093 A135312

Adjacent sequences:  A057709 A057710 A057711 * A057713 A057714 A057715

KEYWORD

nonn,nice

AUTHOR

N. J. A. Sloane, Oct 27 2000

EXTENSIONS

Link updated by William Rex Marshall, Dec 16 2009

STATUS

approved

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Last modified June 18 07:24 EDT 2019. Contains 324203 sequences. (Running on oeis4.)