A238074 Number of (n+1)X(1+1) 0..3 arrays with the maximum plus the minimum of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one

256, 1592, 9884, 59772, 378708, 2285576, 14349272, 86693008, 546582828, 3300593268, 20768825876, 125443787248, 790067077480, 4771492579096, 30039037764956, 181425384418428, 1142390702895284, 6899484032213320

Offset

1,1

Comments

Column 1 of A238081

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Formula

Empirical: a(n) = 17*a(n-2) +736*a(n-4) +2353*a(n-6) +2483*a(n-8) +800*a(n-10) for n>11

Example

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

Crossrefs

Sequence in context: A237921 A237915 A238081 * A251974 A250429 A238155

Adjacent sequences: A238071 A238072 A238073 * A238075 A238076 A238077

Keyword

nonn

Author

R. H. Hardin, Feb 17 2014

Status

approved