A186938 Number of (n+1)X9 binary arrays with every 2X2 subblock trace equal to exactly one or two horizontal and vertical neighbor 2X2 subblock traces

7528, 431656, 5769904, 102475864, 1627815216, 28477050608, 475637108896, 8132915749352, 137957613500896, 2350443973085288, 39973429999524952, 680134904601046536, 11574046354140738136, 196965440910144079296

Offset

1,1

Comments

Column 8 of A186939

Links

R. H. Hardin, Table of n, a(n) for n = 1..25

Example

Some solutions for 4X9
..0..1..1..1..1..0..0..1..0....0..0..1..0..0..0..1..1..0
..0..1..0..1..1..0..0..1..1....0..1..1..0..0..1..1..1..0
..0..0..0..0..1..0..0..1..1....0..0..1..1..0..1..1..1..0
..0..0..0..0..1..0..0..1..1....0..0..0..1..0..1..1..0..0

Crossrefs

Sequence in context: A093225 A090742 A273382 * A185749 A077096 A031137

Adjacent sequences: A186935 A186936 A186937 * A186939 A186940 A186941

Keyword

nonn

Author

R. H. Hardin Mar 01 2011

Status

approved