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A203093 Number of n X n 0..3 arrays with every nonzero element less than or equal to some horizontal or vertical neighbor 1
1, 84, 48552, 308642476, 27467664499412, 32766523337754473494, 516228209623915573866603862, 107889416526594162925859037893676244 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A203101

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Sequence in context: A185403 A269897 A184896 * A290274 A289557 A202580

Adjacent sequences:  A203090 A203091 A203092 * A203094 A203095 A203096

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 29 2011

STATUS

approved

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Last modified April 5 13:14 EDT 2020. Contains 333241 sequences. (Running on oeis4.)