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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

R. H. Hardin, Table of n, a(n) for n = 0..19

CROSSREFS

Sequence in context: A060381 A256369 A145328 * A012943 A013059 A013098

Adjacent sequences:  A139807 A139808 A139809 * A139811 A139812 A139813

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 23 2008

STATUS

approved

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Last modified December 3 01:12 EST 2016. Contains 278694 sequences.