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A237636 Number of (n+1)X(7+1) 0..2 arrays with the upper median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one 1
30656, 16448, 4132, 5976, 7756, 11984, 18344, 23968, 35732, 47936, 71426, 95872, 140200, 191744, 286672, 383488, 560800, 766976, 1146688, 1533952, 2243200, 3067904, 4586752, 6135808, 8972800, 12271616, 18347008, 24543232, 35891200 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 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>15

EXAMPLE

Some solutions for n=5

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

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

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

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

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

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

CROSSREFS

Sequence in context: A234791 A134118 A235853 * A236126 A236944 A269828

Adjacent sequences:  A237633 A237634 A237635 * A237637 A237638 A237639

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 10 2014

STATUS

approved

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Last modified January 22 17:46 EST 2022. Contains 350484 sequences. (Running on oeis4.)