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A206691 Number of nX7 0..3 arrays with no element equal to another within two positions in the same row or column, and new values 0..3 introduced in row major order 1
16, 1216, 11264, 127008, 1454810, 17277556, 208563912, 2543024548, 31198656992, 384076975680, 4737250216482, 58497114248288, 722787914355820, 8933909144447138, 110448738176212632, 1365616810440861728 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A206692

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A254333 A102807 A160131 * A064346 A222888 A113104

Adjacent sequences:  A206688 A206689 A206690 * A206692 A206693 A206694

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 11 2012

STATUS

approved

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Last modified October 5 10:20 EDT 2022. Contains 357255 sequences. (Running on oeis4.)