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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A050974 Number of binary arrangements on n X n array without three adjacent 1's in a row or column. 2

%I

%S 2,16,265,16561,3157010,1828904402,3323590649777,18691199385898465,

%T 325778072452564800064,17617718915229579206450786,

%U 2954164381835835259001326344913,1536134628973698280539373190731911729

%N Number of binary arrangements on n X n array without three adjacent 1's in a row or column.

%D S. R. Finch, Mathematical Constants, Cambridge, 2003, pp. 342-349.

%H S. R. Finch, <a href="http://www.people.fas.harvard.edu/~sfinch/constant/square/square.html">Hard Square Entropy Constant</a>

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/01-Matrix.html">01-Matrix.</a>

%Y Any connected three 1's gives A067968.

%Y Cf. A006506.

%K nonn

%O 1,1

%A _Eric W. Weisstein_

%E More terms from _R. H. Hardin_, Feb 02 2002

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 October 20 12:34 EDT 2018. Contains 316379 sequences. (Running on oeis4.)