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A236782 Number of (n+1)X(1+1) 0..2 arrays with the upper median plus the lower median minus the minimum of every 2X2 subblock equal 1
81, 255, 770, 2475, 7967, 26320, 87685, 296341, 1009386, 3469327, 11995679, 41723704, 145746621, 511140805, 1798008490, 6341897735, 22416736479, 79385995448, 281564936853, 999990174053, 3555463819754, 12653797570015 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A236789

LINKS

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

FORMULA

Empirical: a(n) = 9*a(n-1) -201*a(n-3) +319*a(n-4) +1872*a(n-5) -4022*a(n-6) -9892*a(n-7) +22860*a(n-8) +34480*a(n-9) -71032*a(n-10) -84736*a(n-11) +121824*a(n-12) +140864*a(n-13) -100416*a(n-14) -135936*a(n-15) +17408*a(n-16) +54784*a(n-17) +14336*a(n-18)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

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

CROSSREFS

Sequence in context: A236789 A236798 A237067 * A236791 A237060 A237637

Adjacent sequences:  A236779 A236780 A236781 * A236783 A236784 A236785

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 31 2014

STATUS

approved

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Last modified December 3 20:55 EST 2020. Contains 338920 sequences. (Running on oeis4.)