A237101 Number of (n+1)X(1+1) 0..2 arrays with the maximum minus the upper median of every 2X2 subblock equal

81, 385, 1881, 9491, 48569, 252415, 1324297, 7013479, 37376009, 200312023, 1077728201, 5817662711, 31477339337, 170637062839, 926272600521, 5033545168183, 27374673893833, 148966846198839, 811006553994697

Offset

1,1

Comments

Column 1 of A237108

Links

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

Formula

Empirical: a(n) = 9*a(n-1) -166*a(n-3) +224*a(n-4) +820*a(n-5) -1088*a(n-6) -1608*a(n-7) +1712*a(n-8) +1280*a(n-9) -832*a(n-10) -320*a(n-11)

Example

Some solutions for n=5
..1..0....1..2....1..1....0..2....0..1....1..1....0..0....1..2....1..2....1..2
..2..2....0..1....2..2....0..1....1..0....0..1....0..1....0..2....1..2....2..1
..2..2....0..0....0..1....2..1....1..0....2..2....2..0....2..0....2..2....0..2
..1..0....1..2....1..0....0..1....0..1....2..2....1..1....2..2....0..0....0..2
..2..2....1..0....1..0....2..1....1..1....1..1....1..2....0..0....2..2....2..1
..0..1....2..1....1..0....0..1....1..1....0..0....0..0....0..0....1..1....0..2

Crossrefs

Sequence in context: A236028 A233157 A237108 * A236618 A236611 A236719

Adjacent sequences: A237098 A237099 A237100 * A237102 A237103 A237104

Keyword

nonn

Author

R. H. Hardin, Feb 03 2014

Status

approved