A139810 Number of n X n binary matrices containing no 2 X 2 all-1s sub-block.

1, 2, 15, 417, 42176, 15701273, 21418970801, 107224417436160, 1968910887183791359, 132633131268024896655873, 32775983842712963307230834176, 29712661745725058784174163778464369

Offset

0,2

Links

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

Crossrefs

Sequence in context: A060381 A256369 A145328 * A012943 A363834 A013059

Adjacent sequences: A139807 A139808 A139809 * A139811 A139812 A139813

Keyword

nonn

Author

R. H. Hardin, May 23 2008

Status

approved