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

 

Logo

Invitation: celebrating 50 years of OEIS, 250000 sequences, and Sloane's 75th, there will be a conference at DIMACS, Rutgers, Oct 9-10 2014.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A181246 Number of nX3 binary matrices with no 2X2 block having four 1's 1
8, 57, 417, 3032, 22077, 160697, 1169792, 8515337, 61986457, 451223152, 3284626797, 23910060017, 174050512312, 1266980540057, 9222838063377, 67136581219272, 488712965249117, 3557529413370537, 25896623226618032 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A181253

LINKS

R. H. Hardin, Table of n, a(n) for n=1..200

FORMULA

Empirical: a(n)=6*a(n-1)+10*a(n-2)-5*a(n-3)

CROSSREFS

Sequence in context: A097114 A022038 A015453 * A199555 A241594 A241595

Adjacent sequences:  A181243 A181244 A181245 * A181247 A181248 A181249

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 10 2010

STATUS

approved

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

Content is available under The OEIS End-User License Agreement .

Last modified August 1 09:41 EDT 2014. Contains 245113 sequences.