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A233019 Number of n X n 0..3 arrays with no element x(i,j) adjacent to value 3-x(i,j) horizontally, vertically, diagonally or antidiagonally, and top left element zero 1
1, 15, 849, 179999, 149128385, 487651369463, 6338787392715565, 328918675019714663095, 68332288847776936953486283, 56955693489584720827393016043135 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A233026

LINKS

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

EXAMPLE

Some solutions for n=4

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

..0..2..2..2....2..0..2..2....2..0..0..2....0..2..0..2....2..0..2..2

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

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

CROSSREFS

Sequence in context: A020240 A281695 A223276 * A270962 A223818 A208349

Adjacent sequences:  A233016 A233017 A233018 * A233020 A233021 A233022

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 03 2013

STATUS

approved

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Last modified September 19 15:43 EDT 2020. Contains 337178 sequences. (Running on oeis4.)