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A181247 Number of nX4 binary matrices with no 2X2 block having four 1's 1
16, 216, 3032, 42176, 587920, 8191392, 114142368, 1590466304, 22161786304, 308805072256, 4302929532288, 59957567962112, 835456401197312, 11641356029819392, 162212139560176128, 2260284639281590272 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A181253

LINKS

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

FORMULA

Empirical: a(n)=10*a(n-1)+54*a(n-2)+16*a(n-3)-64*a(n-4)

CROSSREFS

Sequence in context: A125473 A239096 A159739 * A138454 A235758 A086650

Adjacent sequences:  A181244 A181245 A181246 * A181248 A181249 A181250

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 10 2010

STATUS

approved

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Last modified April 19 21:10 EDT 2014. Contains 240777 sequences.