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A181252 Number of nX9 binary matrices with no 2X2 block having four 1's 1
512, 169209, 61986457, 22161786304, 7969215344753, 2861765993703849, 1027999596778673856, 369248337357375835969, 132633131268024896655873, 47641303155727829675539968, 17112587585474467714330327353 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 9 of A181253

LINKS

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

CROSSREFS

Sequence in context: A013701 A187461 A181244 * A016749 A144323 A220303

Adjacent sequences:  A181249 A181250 A181251 * A181253 A181254 A181255

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 10 2010

STATUS

approved

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Last modified April 20 23:07 EDT 2014. Contains 240824 sequences.