|
| |
|
|
A006765
|
|
Number of polyominoes with n cells.
(Formerly M3421)
|
|
4
| |
|
|
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; internal format)
|
|
|
|
OFFSET
| 1,4
|
|
|
COMMENTS
| A000105 is the main entry for this sequence.
|
|
|
REFERENCES
| Dan Hoey, Bill Gosper and Rich Schroeppel, Discussions in Math-Fun Mailing list, circa Jul 13 1999.
W. F. Lunnon, Counting multidimensional polyominoes. Computer Journal 18 (1975), no. 4, pp. 366-367.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
|
|
|
LINKS
| R. C. Schroeppel, A few mathematical experiments
N. J. A. Sloane, Table of n, a(n) for n = 1..45
|
|
|
CROSSREFS
| Equals A000105(n)-1. A row of A049429. A column of A049430.
Sequence in context: A180305 A060925 A027045 * A151272 A112272 A149234
Adjacent sequences: A006762 A006763 A006764 * A006766 A006767 A006768
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
|
|
|
EXTENSIONS
| Edited by N. J. A. Sloane, Sep 23 2011.
|
| |
|
|
