A237634 - OEIS

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A237634

Number of (n+1)X(5+1) 0..2 arrays with the upper median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one

4621, 4500, 2086, 2816, 4622, 5656, 7756, 11312, 17626, 22624, 30496, 45248, 70792, 90496, 121984, 180992, 283168, 361984, 487936, 723968, 1132672, 1447936, 1951744, 2895872, 4530688, 5791744, 7806976, 11583488, 18122752, 23166976, 31227904

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Column 5 of A237637

LINKS

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

FORMULA

Empirical: a(n) = 4*a(n-4) for n>13

EXAMPLE

Some solutions for n=5

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

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

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

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

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

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

CROSSREFS

Sequence in context: A189983 A295431 A338337 * A051649 A140175 A116226

Adjacent sequences: A237631 A237632 A237633 * A237635 A237636 A237637

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 10 2014

STATUS

approved