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 A006765 Number of polyominoes with n cells. (Formerly M3421) 5
 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; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 COMMENTS A000105 is the main entry for this sequence. REFERENCES 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). LINKS 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. MATHEMATICA Cases[Import["https://oeis.org/A000105/b000105.txt", "Table"], {_, _}][[All, 2]] - 1 // Rest (* Jean-François Alcover, Jan 21 2020 *) CROSSREFS 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 KEYWORD nonn AUTHOR EXTENSIONS Edited by N. J. A. Sloane, Sep 23 2011 STATUS approved

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Last modified April 21 13:33 EDT 2021. Contains 343153 sequences. (Running on oeis4.)