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A006765
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Number of polyominoes with n cells.
(Formerly M3421)
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5
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0, 0, 1, 4, 11, 34, 107, 368, 1284, 4654, 17072, 63599, 238590, 901970, 3426575, 13079254, 50107908, 192622051, 742624231, 2870671949, 11123060677, 43191857687, 168047007727, 654999700402, 2557227044763, 9999088822074, 39153010938486, 153511100594602, 602621953061977, 2368347037571251, 9317706529987949, 36695016991712878
(list;
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refs;
listen;
history;
text;
internal format)
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OFFSET
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1,4
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COMMENTS
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A000105 is the main entry for this sequence.
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REFERENCES
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Dan Hoey, Bill Gosper and Richard C. Schroeppel, Discussions in Math-Fun Mailing list, circa Jul 13 1999.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
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N. J. A. Sloane, Table of n, a(n) for n = 1..45
W. F. Lunnon, Counting multidimensional polyominoes. Computer Journal 18 (1975), no. 4, pp. 366-367.
R. C. Schroeppel, A few mathematical experiments, Experimental Mathematics Workshop, Oakland, California, March 30, 2004.
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MATHEMATICA
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Cases[Import["https://oeis.org/A000105/b000105.txt", "Table"], {_, _}][[All, 2]] - 1 // Rest (* Jean-François Alcover, Jan 21 2020 *)
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CROSSREFS
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Equals A000105(n)-1. A row of A049429. A column of A049430.
Sequence in context: A027045 A243781 A227329 * A151272 A112272 A149234
Adjacent sequences: A006762 A006763 A006764 * A006766 A006767 A006768
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane
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EXTENSIONS
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Edited by N. J. A. Sloane, Sep 23 2011
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STATUS
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approved
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