A238172 Number of (n+1)X(n+1) 0..2 arrays with the maximum plus the minimum of every 2X2 subblock equal

81, 5321, 2027833, 4299264833, 45437916131409, 2393955748528492505, 623815081258096395684729, 805387942935330352515024477169, 5148561164308481771405615002316297841

Offset

1,1

Comments

Diagonal of A238180

Links

Table of n, a(n) for n=1..9.

Example

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

Crossrefs

Sequence in context: A219728 A187454 A206406 * A260858 A237300 A237937

Adjacent sequences: A238169 A238170 A238171 * A238173 A238174 A238175

Keyword

nonn

Author

R. H. Hardin, Feb 19 2014

Status

approved