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A070765
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Number of polyiamonds with n cells, without holes.
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6
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1, 1, 1, 3, 4, 12, 24, 66, 159, 444, 1161, 3226, 8785, 24453, 67716, 189309, 528922, 1484738, 4172185, 11756354, 33174451, 93795220, 265565628, 753060469, 2138206966, 6078931114, 17302380313, 49302121747, 140627400927, 401510058179
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OFFSET
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1,4
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REFERENCES
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E. V. Konstantinova and M. V. Vidyuk, Discriminating tests of information and topological indices; animals and trees; J. Chem. Inf. Comput. Sci., 43 (2003), 1860-1871.
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LINKS
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Table of n, a(n) for n=1..30.
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CROSSREFS
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Equals A000577(n)-A070764(n). Cf. A000104, A018190.
Sequence in context: A081621 A073713 A084921 * A000577 A111758 A000942
Adjacent sequences: A070762 A070763 A070764 * A070766 A070767 A070768
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KEYWORD
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hard,nonn
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AUTHOR
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Joseph Myers, May 05 2002
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EXTENSIONS
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More terms from Joseph Myers, Nov 11 2003
a(29) and a(30) from Joseph Myers, Nov 21 2010
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STATUS
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approved
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