A235975 - OEIS

A235975

Number of (n+1)X(2+1) 0..2 arrays with the upper median equal to the lower median in every 2X2 subblock

181, 1473, 11239, 89555, 703565, 5579529, 44112111, 349456139, 2766556005, 21911565169, 173518250295, 1374222186243, 10883168081725, 86191072211609, 682600082348735, 5405952460295995, 42813179725209813, 339065137371681409

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OFFSET

1,1

COMMENTS

Column 2 of A235981

LINKS

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

FORMULA

Empirical: a(n) = 11*a(n-1) -9*a(n-2) -173*a(n-3) +380*a(n-4) +324*a(n-5) -1056*a(n-6) +176*a(n-7) +256*a(n-8) -64*a(n-9)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A107255 A163442 A268520 * A137530 A069763 A264289

Adjacent sequences: A235972 A235973 A235974 * A235976 A235977 A235978

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 17 2014

STATUS

approved