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A235876 Number of (n+1)X(n+1) 0..2 arrays with the minimum plus the upper median equal to the lower median plus the maximum in every 2X2 subblock 0
21, 105, 453, 1833, 7221, 28185, 109893, 429513, 1684821, 6633465, 26204133, 103802793, 412120821, 1639113945 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A235884

LINKS

Table of n, a(n) for n=1..14.

FORMULA

Empirical: a(n) = 10*a(n-1) -35*a(n-2) +50*a(n-3) -24*a(n-4)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

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

CROSSREFS

Sequence in context: A126229 A060537 A116689 * A279763 A068986 A219631

Adjacent sequences:  A235873 A235874 A235875 * A235877 A235878 A235879

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 16 2014

STATUS

approved

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Last modified February 19 04:00 EST 2020. Contains 332034 sequences. (Running on oeis4.)