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A238172 Number of (n+1)X(n+1) 0..2 arrays with the maximum plus the minimum of every 2X2 subblock equal 0
81, 5321, 2027833, 4299264833, 45437916131409, 2393955748528492505, 623815081258096395684729, 805387942935330352515024477169, 5148561164308481771405615002316297841 (list; graph; refs; listen; history; text; internal format)
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

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Last modified November 29 18:41 EST 2021. Contains 349416 sequences. (Running on oeis4.)