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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 1
0, 124, 456, 3034, 22852, 201592, 1807682, 16202418, 145774974, 1316654208, 11925318054, 108181945306, 982423923962, 8927514669564, 81157461251264, 737931539839332, 6710435168666098, 61025322017165952, 554987343000961892 (list; graph; refs; listen; history; text; internal format)
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

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Last modified January 26 17:44 EST 2023. Contains 359833 sequences. (Running on oeis4.)