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A238040 Number of (n+1)X(2+1) 0..2 arrays with the upper median minus the lower median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one 1
340, 1944, 10812, 61668, 352180, 1999804, 11359816, 64650988, 367695852, 2090439976, 11887700660, 67607537176, 384454848916, 2186228909392, 12432532688900, 70700318548692, 402048993757740, 2286326651710856 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A238046

LINKS

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

FORMULA

Empirical: a(n) = 7*a(n-2) +64*a(n-3) +307*a(n-4) +593*a(n-5) +1251*a(n-6) +1168*a(n-7) -388*a(n-8) -1956*a(n-9) -4912*a(n-10) -2576*a(n-11) +1664*a(n-12) +768*a(n-13)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A076748 A306865 A205223 * A237959 A232514 A187383

Adjacent sequences:  A238037 A238038 A238039 * A238041 A238042 A238043

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 17 2014

STATUS

approved

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Last modified December 2 22:46 EST 2021. Contains 349445 sequences. (Running on oeis4.)