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Search: id:A001931
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| A001931 |
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Number of fixed 3-dimensional polyominoes with n cells; lattice animals in the simple cubic lattice (6 nearest neighbors), face-connected cubes.
(Formerly M2996 N1213)
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+0
3
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| 1, 3, 15, 86, 534, 3481, 23502, 162913, 1152870, 8294738, 60494549, 446205905, 3322769321, 24946773111, 188625900446, 1435074454755, 10977812452428
(list; graph; listen)
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OFFSET
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1,2
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REFERENCES
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W. F. Lunnon, Symmetry of cubical and general polyominoes, pp. 101-108 of R. C. Read, editor, Graph Theory and Computing. Academic Press, NY, 1972.
D. H. Redelmeier, personal communication.
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CROSSREFS
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Sequence in context: A084209 A127085 A093615 this_sequence A075841 A089022 A132371
Adjacent sequences: A001928 A001929 A001930 this_sequence A001932 A001933 A001934
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KEYWORD
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nonn,nice
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AUTHOR
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njas
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EXTENSIONS
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a(17) from Achim Flammenkamp (achim(AT)uni-bielefeld.de) Feb 15 1999.
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