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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

%I

%S 1,4,13,60,276,1416,7201,37972

%N 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.

%D Enumeration attributed by Andrew Clarke to Brendan Owen.

%H Andrew Clarke, <a href="http://www.recmath.com/PolyPages/PolyPages/Polyhes.htm">Polyhes</a>

%H <a href="/A057712/a057712.gif">Picture from Andrew Clarke's page showing triangle formed by combining polyhes of orders 1, 2 and 3.</a>

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/Polyhe.html">Polyhe</a>

%K nonn,nice

%O 1,2

%A _N. J. A. Sloane_, Oct 27 2000

%E Link updated by _William Rex Marshall_, Dec 16 2009

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Last modified July 22 05:47 EDT 2019. Contains 325213 sequences. (Running on oeis4.)