login
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
OFFSET
1,1
COMMENTS
Column 7 of A237637
LINKS
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
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 10 2014
STATUS
approved