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A139810
Number of n X n binary matrices containing no 2 X 2 all-1s sub-block.
12
1, 2, 15, 417, 42176, 15701273, 21418970801, 107224417436160, 1968910887183791359, 132633131268024896655873, 32775983842712963307230834176, 29712661745725058784174163778464369
OFFSET
0,2
LINKS
CROSSREFS
Sequence in context: A060381 A256369 A145328 * A012943 A363834 A013059
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 23 2008
STATUS
approved