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A181249 Number of nX6 binary matrices with no 2X2 block having four 1's 1
64, 3105, 160697, 8191392, 419045269, 21418970801, 1095020802848, 55979092539545, 2861765993703849, 146298965997241152, 7479088292930771309, 382345515897175884705, 19546245848381921238016, 999242067236417336040593 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A181253

LINKS

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

FORMULA

Empirical: a(n)=33*a(n-1)+908*a(n-2)+1687*a(n-3)-37947*a(n-4)-16572*a(n-5)+513993*a(n-6)-663729*a(n-7)-486540*a(n-8)+617409*a(n-9)+191835*a(n-10)-49140*a(n-11)

CROSSREFS

Sequence in context: A221831 A221090 A264094 * A260857 A183814 A017439

Adjacent sequences:  A181246 A181247 A181248 * A181250 A181251 A181252

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 10 2010

STATUS

approved

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Last modified December 11 06:55 EST 2016. Contains 279043 sequences.