A183968 Number of (n+1) X 7 0..2 arrays with no 2 X 2 subblock sum differing from a horizontal or vertical neighbor subblock sum by more than one.

586791, 53575889, 5344196941, 615149254565, 71600778588343

Offset

1,1

Comments

Column 6 of A183971.

Links

Table of n, a(n) for n=1..5.

Example

Some solutions for 3 X 7
..0..0..2..0..2..0..2....0..0..0..0..0..0..0....0..0..1..0..1..0..1
..2..0..0..0..0..0..0....1..0..2..0..2..1..1....0..0..0..0..1..1..0
..0..0..2..0..2..1..2....0..0..0..0..0..0..1....1..0..0..1..0..0..1
...
...2..2..2..2..2..2.......1..2..2..2..3..2.......0..1..1..2..3..2...
...2..2..2..2..3..3.......1..2..2..2..3..3.......1..0..1..2..2..2...

Crossrefs

Cf. A183971.

Sequence in context: A254551 A254558 A254481 * A104962 A100386 A205214

Adjacent sequences: A183965 A183966 A183967 * A183969 A183970 A183971

Keyword

nonn

Author

R. H. Hardin, Jan 08 2011

Status

approved