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A075224 Number of anisohedral polyiamonds with n cells. 10


%S 0,0,0,0,0,0,0,0,6,25,53,47,97,281,280,343,345,1367,619,2478,1504,

%T 8292,1811,16742,3458,48453,5459,95311,9416,333739

%N Number of anisohedral polyiamonds with n cells.

%C A tiling is isohedral if the symmetries of the tiling act transitively on the tiles; a shape is anisohedral if it tiles the plane, but not isohedrally.

%D Branko Gr├╝nbaum and G. C. Shephard, Tilings and Patterns. W. H. Freeman, New York, 1987, Section 9.4.

%H Joseph Myers, <a href="http://www.polyomino.org.uk/mathematics/polyform-tiling/">Polyiamond tiling</a>

%Y Cf. A071332, A075216, A075217, A075218, A075219, A075220, A075221, A075222, A075223, A075206, A075215.

%K hard,nonn

%O 1,9

%A _Joseph Myers_, Sep 08 2002

%E More terms from _Joseph Myers_, Nov 11 2003

%E a(29) and a(30) from _Joseph Myers_, Nov 21 2010

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Last modified November 22 16:26 EST 2019. Contains 329396 sequences. (Running on oeis4.)