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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 A208596 A002402

Adjacent sequences:  A181243 A181244 A181245 * A181247 A181248 A181249

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 10 2010

STATUS

approved

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Last modified April 18 03:24 EDT 2014. Contains 240688 sequences.