A231055 Number of 7Xn 0..3 arrays x(i,j) with each element horizontally, diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 4 and at least one element with value (x(i,j)-1) mod 4, no adjacent elements equal, and upper left element zero

0, 186, 103042, 2150784, 142466422, 17477913984, 1729680196768, 158221269380622, 14887507767060602, 1416719151612712022, 134288584880419541140, 12708181576270666389178, 1203310523895674472408272

Offset

1,2

Comments

Row 7 of A231049

Links

R. H. Hardin, Table of n, a(n) for n = 1..32

Example

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

Crossrefs

Sequence in context: A299830 A265171 A146502 * A068257 A226675 A226672

Adjacent sequences: A231052 A231053 A231054 * A231056 A231057 A231058

Keyword

nonn

Author

R. H. Hardin, Nov 03 2013

Status

approved