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A202631 Number of n X n 0..3 arrays with adjacent row and column sums unequal 1
4, 184, 143028, 1960824272, 443471777729100 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A202636

LINKS

Table of n, a(n) for n=1..5.

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A174772 A146549 A156905 * A102194 A102191 A266492

Adjacent sequences:  A202628 A202629 A202630 * A202632 A202633 A202634

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 21 2011

STATUS

approved

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Last modified January 25 01:37 EST 2020. Contains 331229 sequences. (Running on oeis4.)