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A236781 Number of (n+1)X(n+1) 0..2 arrays with the upper median plus the lower median minus the minimum of every 2X2 subblock equal 0
81, 1097, 23675, 1287919, 128004881, 32223974061, 13954220420440, 15244019769376849, 29037002912540214181 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A236789

LINKS

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

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A264203 A236047 A264000 * A237059 A236010 A230677

Adjacent sequences:  A236778 A236779 A236780 * A236782 A236783 A236784

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 31 2014

STATUS

approved

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Last modified October 26 11:28 EDT 2020. Contains 338027 sequences. (Running on oeis4.)