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A237958 Number of (n+1)X(1+1) 0..2 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
81, 340, 1422, 6042, 25777, 109200, 462852, 1962464, 8337456, 35340888, 150013756, 635934272, 2700293296, 11446693312, 48598395488, 206013123488, 874700630800, 3707927149312, 15742965653824, 66735768122368, 283346471210496 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A237965

LINKS

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

FORMULA

Empirical: a(n) = 216*a(n-4) +1692*a(n-6) +4288*a(n-8) +3968*a(n-10) +1024*a(n-12)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

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

CROSSREFS

Sequence in context: A236895 A237965 A238046 * A238039 A232284 A337044

Adjacent sequences:  A237955 A237956 A237957 * A237959 A237960 A237961

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 16 2014

STATUS

approved

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Last modified June 26 09:45 EDT 2022. Contains 354879 sequences. (Running on oeis4.)