A230824 - OEIS

A230824

Number of n X n 0..3 arrays x(i,j) with each element horizontally, vertically 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, 2, 8, 62, 898, 29446, 1807682, 188719562, 33264404940, 9945976161290

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OFFSET

1,2

COMMENTS

Diagonal of A230831

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=4

..0..3..1..0....0..1..2..3....0..3..2..1....0..1..0..1....0..1..3..0

..1..2..3..1....3..0..1..0....1..0..3..0....3..2..3..2....3..2..1..3

..3..1..2..3....2..3..2..3....2..1..2..1....0..1..0..3....1..3..2..1

..0..3..1..0....1..0..1..0....3..0..3..0....3..2..1..2....0..1..3..0

CROSSREFS

Sequence in context: A161566 A192516 A159476 * A006245 A202751 A227160

Adjacent sequences: A230821 A230822 A230823 * A230825 A230826 A230827

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 30 2013

STATUS

approved