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A236783 Number of (n+1)X(2+1) 0..2 arrays with the upper median plus the lower median minus the minimum of every 2X2 subblock equal 1
255, 1097, 4452, 19851, 87889, 405350, 1877803, 8891685, 42339874, 204256129, 989815233, 4835576474, 23700386333, 116758334093, 576519616008, 2856054677187, 14171463522891, 70467204359198, 350790297038485 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A236789

LINKS

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

FORMULA

Empirical: a(n) = 22*a(n-1) -145*a(n-2) -234*a(n-3) +6880*a(n-4) -19940*a(n-5) -92792*a(n-6) +593404*a(n-7) +66753*a(n-8) -7105820*a(n-9) +10259982*a(n-10) +44201366*a(n-11) -120008970*a(n-12) -136396696*a(n-13) +699300702*a(n-14) +46313296*a(n-15) -2478218108*a(n-16) +1244671494*a(n-17) +5661814333*a(n-18) -5050034688*a(n-19) -8465863134*a(n-20) +10417098396*a(n-21) +8197726584*a(n-22) -13227353752*a(n-23) -4935036828*a(n-24) +10838034848*a(n-25) +1645800008*a(n-26) -5758739808*a(n-27) -170986944*a(n-28) +1942394944*a(n-29) -64872256*a(n-30) -395392512*a(n-31) +22059776*a(n-32) +43732480*a(n-33) -1955840*a(n-34) -1996800*a(n-35)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

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

CROSSREFS

Sequence in context: A143035 A157778 A158010 * A237061 A236792 A259247

Adjacent sequences:  A236780 A236781 A236782 * A236784 A236785 A236786

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 31 2014

STATUS

approved

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Last modified October 22 07:06 EDT 2021. Contains 348160 sequences. (Running on oeis4.)