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A237405 Number of (n+1) X (1+1) 0..2 arrays with the maximum plus the upper median plus the minimum of every 2 X 2 subblock differing from its horizontal and vertical neighbors by exactly one. 1
81, 322, 1278, 5228, 21456, 87164, 354008, 1441060, 5874828, 23898504, 97285848, 395850152, 1612369288, 6560036288, 26713782880, 108690607360, 442654390864, 1801008543856, 7334492421904, 29841672996416, 121530533355584 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A237412.

LINKS

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

FORMULA

Empirical: a(n) = 200*a(n-4) +1216*a(n-6) +604*a(n-8) -4556*a(n-10) -2656*a(n-12) +1808*a(n-14) +1024*a(n-16).

EXAMPLE

Some solutions for n=5

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

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

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

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

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

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

CROSSREFS

Sequence in context: A101963 A053171 A237412 * A250443 A017162 A250427

Adjacent sequences:  A237402 A237403 A237404 * A237406 A237407 A237408

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 07 2014

STATUS

approved

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Last modified May 11 11:54 EDT 2021. Contains 343791 sequences. (Running on oeis4.)