A233981 Number of (n+1)X(n+1) 0..4 arrays with every 2X2 subblock having the sum of the squares of the edge differences equal to 10, and no two adjacent values equal

56, 1540, 92320, 14319916, 5240298896, 5022726159372, 11561322774100248, 70171451208621164920, 1027798919027876753208824

Offset

1,1

Comments

Diagonal of A233989

Links

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

Example

Some solutions for n=3
..2..4..2..4....1..3..1..2....4..2..3..2....2..0..2..3....2..3..2..1
..4..3..4..3....3..4..2..0....2..3..1..3....3..2..3..1....0..2..0..2
..2..4..2..1....4..2..1..2....3..1..0..2....2..4..2..3....1..3..1..3
..4..3..4..2....3..4..2..0....2..3..2..1....1..2..3..1....0..2..0..1

Crossrefs

Sequence in context: A319310 A022081 A017772 * A035723 A035799 A278362

Adjacent sequences: A233978 A233979 A233980 * A233982 A233983 A233984

Keyword

nonn

Author

R. H. Hardin, Dec 18 2013

Status

approved