A185494 Number of (n+1)X7 binary arrays with every 2X2 subblock sum equal to some horizontal or vertical neighbor 2X2 subblock sum

1332, 114724, 5442964, 294899588, 15557758676, 835833221744, 44566790792864, 2389300393136984, 127764645248937538

Offset

1,1

Comments

Column 6 of A185497

Links

Table of n, a(n) for n=1..9.

Example

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

Crossrefs

Sequence in context: A044882 A158743 A188308 * A035862 A003907 A043613

Adjacent sequences: A185491 A185492 A185493 * A185495 A185496 A185497

Keyword

nonn

Author

R. H. Hardin Jan 29 2011

Status

approved