login
This site is supported by donations to The OEIS Foundation.

 

Logo

Annual Appeal: Please make a donation (tax deductible in USA) to keep the OEIS running. Over 5000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A019473 Number of stable n-celled patterns ("still lifes") in Conway's game of Life. 12
0, 0, 0, 2, 1, 5, 4, 9, 10, 25, 46, 121, 240, 619, 1353, 3286, 7773, 19044, 45759, 112243, 273188, 672172, 1646147, 4051726 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Table of n, a(n) for n=1..24.

N. D. Elkies, [math/9905194] The still-Life density problem and its generalizations, arXiv:math/9905194 [math.CO], 1999.

H. Koenig, Stable Objects (another version of this sequence)

R. Munafo, Still-Lifes with N cells in Conway's game of Life

Mark D. Niemiec, Life Object Counts

R. C. Schroeppel, A few mathematical experiments

Eric Weisstein's World of Mathematics, Life

EXAMPLE

a(4)=2 because the block and the tub are the only 4-cell still lifes.

CROSSREFS

Cf. A056613, A056614, A056605.

Sequence in context: A259791 A207480 A166517 * A056605 A091802 A144240

Adjacent sequences:  A019470 A019471 A019472 * A019474 A019475 A019476

KEYWORD

hard,nonn,nice

AUTHOR

Robert Munafo

EXTENSIONS

More terms from Stephen A. Silver, Dec 11 1999

a(24) corrected by Nathaniel Johnston, Aug 26 2016 at the suggestion of Mark Niemiec.

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified December 7 14:52 EST 2016. Contains 278877 sequences.