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A238140 Number of (n+1)X(1+1) 0..3 arrays with the maximum plus the lower median minus the minimum of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one 1
256, 1810, 12981, 94458, 687254, 4977790, 36125717, 262009080, 1902689356, 13793932488, 100152908224, 726176038552, 5272782009672, 38229547221928, 277581361120444, 2012592670155936, 14613326239922048, 105952842547441728 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A238145

LINKS

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

FORMULA

Empirical: a(n) = 1808*a(n-4) +44640*a(n-6) +335068*a(n-8) -484208*a(n-10) -15068144*a(n-12) -32087616*a(n-14) +167504512*a(n-16) +586957568*a(n-18) -435685376*a(n-20) -3412492288*a(n-22) -1807720448*a(n-24) +6958792704*a(n-26) +9003270144*a(n-28) +190054400*a(n-30) -3628072960*a(n-32) -1132462080*a(n-34)

EXAMPLE

Some solutions for n=4

..2..1....1..0....3..2....2..0....0..3....0..1....2..1....1..3....2..3....0..3

..2..0....1..1....1..3....2..2....1..2....1..2....2..2....1..0....2..3....0..1

..1..3....3..1....3..3....1..2....3..1....1..1....0..0....2..2....3..3....2..3

..1..3....3..0....1..0....1..2....0..2....2..0....1..0....2..2....2..2....3..0

..0..3....3..2....2..2....0..2....0..3....2..2....1..1....3..3....0..0....3..3

CROSSREFS

Sequence in context: A237911 A237905 A238145 * A238298 A238293 A237898

Adjacent sequences:  A238137 A238138 A238139 * A238141 A238142 A238143

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 18 2014

STATUS

approved

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Last modified September 24 13:14 EDT 2022. Contains 356932 sequences. (Running on oeis4.)