A230830 Number of nX7 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, 124, 456, 3034, 22852, 201592, 1807682, 16202418, 145774974, 1316654208, 11925318054, 108181945306, 982423923962, 8927514669564, 81157461251264, 737931539839332, 6710435168666098, 61025322017165952, 554987343000961892

Offset

1,2

Comments

Column 7 of A230831

Links

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

Example

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

Crossrefs

Sequence in context: A204635 A102589 A189812 * A038645 A038859 A206085

Adjacent sequences: A230827 A230828 A230829 * A230831 A230832 A230833

Keyword

nonn

Author

R. H. Hardin, Oct 30 2013

Status

approved