A230897 Number of nX6 0..3 arrays x(i,j) with each element horizontally or vertically 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, 70, 810, 23884, 579218, 15392914, 400106488, 10548244824, 276988116562, 7290773137370, 191799500354366, 5047559049038998, 132829499753935500, 3495691177600683788, 91996653229110438308, 2421116272663216851440

Offset

1,2

Comments

Column 6 of A230899

Links

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

Example

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

Crossrefs

Sequence in context: A027804 A212236 A177298 * A364862 A006037 A002975

Adjacent sequences: A230894 A230895 A230896 * A230898 A230899 A230900

Keyword

nonn

Author

R. H. Hardin, Oct 31 2013

Status

approved