A230909 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, no adjacent elements equal, and upper left element zero

0, 882, 11324, 130178, 1603356, 20713786, 271505344, 3573938648, 47146678686, 622659105328, 8227931798990, 108754213190144, 1437675672142318, 19006711444189020, 251286474365447448, 3322305731095306986

Offset

1,2

Comments

Column 7 of A230910

Links

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

Example

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

Crossrefs

Sequence in context: A092675 A135127 A338538 * A035758 A107554 A089519

Adjacent sequences: A230906 A230907 A230908 * A230910 A230911 A230912

Keyword

nonn

Author

R. H. Hardin, Nov 01 2013

Status

approved