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A236790 Number of (n+1)X(n+1) 0..2 arrays with the maximum plus the upper median plus the minimum of every 2X2 subblock equal 0
81, 1231, 47831, 6154349, 2074360867, 2080964832157, 4969532989834187, 32710340746491266645, 513084052836463355496567 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A236798

LINKS

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

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A236010 A230677 A231994 * A232876 A224355 A016768

Adjacent sequences:  A236787 A236788 A236789 * A236791 A236792 A236793

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 31 2014

STATUS

approved

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Last modified January 26 13:18 EST 2021. Contains 340439 sequences. (Running on oeis4.)