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A237966 Number of (n+1)X(n+1) 0..3 arrays with the upper median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one 0
256, 10014, 369068, 25087700, 3450339192, 713207137992, 276807823136806, 191404026313142728, 237221109913547184542 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A237974

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

Some solutions for n=2

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

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

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

CROSSREFS

Sequence in context: A016960 A224393 A224026 * A205936 A264496 A224967

Adjacent sequences:  A237963 A237964 A237965 * A237967 A237968 A237969

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 16 2014

STATUS

approved

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Last modified May 25 22:17 EDT 2019. Contains 323576 sequences. (Running on oeis4.)