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A237863 Number of (n+1)X(3+1) 0..2 arrays with the upper median plus the lower median minus the minimum of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one 1
1414, 11454, 95470, 811498, 6710651, 55582616, 466228162, 3923377300, 32640488162, 271793432028, 2276818267492, 19078882880296, 159120721843014, 1327754678683016, 11110560232889918, 92946946885743656, 776064525722366116 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A237868

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A204741 A237742 A143192 * A263671 A207046 A237220

Adjacent sequences:  A237860 A237861 A237862 * A237864 A237865 A237866

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 14 2014

STATUS

approved

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Last modified April 23 09:35 EDT 2019. Contains 322385 sequences. (Running on oeis4.)