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A232942 Number of n X n 0..3 arrays with no element x(i,j) adjacent to value 3-x(i,j) horizontally, vertically or antidiagonally, and top left element zero 1
1, 17, 1163, 328989, 389997789, 1950478851269, 41313911641960579, 3714942841397823613817, 1420295754221243029275852053, 2311198726771295243900465723816785 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A232948

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..11

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A130449 A130035 A032629 * A075602 A222985 A229833

Adjacent sequences:  A232939 A232940 A232941 * A232943 A232944 A232945

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 02 2013

STATUS

approved

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Last modified June 15 17:43 EDT 2019. Contains 324142 sequences. (Running on oeis4.)