A183969 Number of (n+1) X 9 0..2 arrays with no 2 X 2 subblock sum differing from a horizontal or vertical neighbor subblock sum by more than one.

22235391, 6415409881, 2080498882227, 802997664018905, 314952766527081107

Offset

1,1

Comments

Column 8 of A183971.

Links

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

Example

Some solutions for 3 X 9
..0..0..0..0..2..0..0..0..0....0..0..0..0..2..0..1..1..0
..1..0..1..0..0..0..1..0..1....1..0..1..0..0..0..0..0..0
..0..0..0..0..1..1..0..0..1....0..0..0..0..1..1..0..2..0
...
...1..1..1..2..2..1..1..1.......1..1..1..2..2..1..2..1...
...1..1..1..1..2..2..1..2.......1..1..1..1..2..1..2..2...

Crossrefs

Cf. A183971.

Sequence in context: A184375 A183799 A205096 * A112644 A179710 A069317

Adjacent sequences: A183966 A183967 A183968 * A183970 A183971 A183972

Keyword

nonn

Author

R. H. Hardin, Jan 08 2011

Status

approved