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A237802 Number of (n+1)X(1+1) 0..2 arrays with the maximum plus the upper median minus the minimum of every 2X2 subblock equal 1
81, 295, 1085, 4251, 16837, 67947, 276369, 1134515, 4684181, 19450171, 81100993, 339457379, 1425136661, 5999163595, 25309534081, 106984014995, 452964814549, 1920577803291, 8153285530497, 34649745217859, 147391128277013 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A237809

LINKS

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

FORMULA

Empirical: a(n) = 7*a(n-1) +15*a(n-2) -179*a(n-3) -a(n-4) +1813*a(n-5) -1183*a(n-6) -9345*a(n-7) +9082*a(n-8) +26172*a(n-9) -31096*a(n-10) -38996*a(n-11) +54928*a(n-12) +26992*a(n-13) -49024*a(n-14) -4160*a(n-15) +18816*a(n-16) -2304*a(n-17) -1536*a(n-18)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

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

CROSSREFS

Sequence in context: A235954 A235947 A237809 * A237779 A237772 A236819

Adjacent sequences:  A237799 A237800 A237801 * A237803 A237804 A237805

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 13 2014

STATUS

approved

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Last modified March 26 10:18 EDT 2019. Contains 321491 sequences. (Running on oeis4.)