A186936 Number of (n+1)X7 binary arrays with every 2X2 subblock trace equal to exactly one or two horizontal and vertical neighbor 2X2 subblock traces

1000, 27272, 241320, 2504264, 25314744, 264604776, 2731872328, 28477050608, 295182600552, 3063267862112, 31785328427832, 329995464895168, 3425533459997032, 35554512231460224, 369074247549339088

Offset

1,1

Comments

Column 6 of A186939

Links

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

Example

Some solutions for 4X7
..0..0..0..0..1..1..1....0..1..0..0..1..0..0....0..0..0..0..0..1..0
..0..0..0..0..0..0..0....0..0..0..1..1..0..0....0..0..0..0..1..1..0
..0..0..1..1..1..0..0....1..0..0..0..1..1..0....1..1..1..1..1..1..0
..1..1..1..1..1..0..1....0..0..1..1..1..1..1....0..0..1..1..1..1..0

Crossrefs

Sequence in context: A277397 A250449 A117690 * A185747 A234787 A029799

Adjacent sequences: A186933 A186934 A186935 * A186937 A186938 A186939

Keyword

nonn

Author

R. H. Hardin Mar 01 2011

Status

approved