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A183963 Number of (n+1)X2 0..2 arrays with no 2X2 subblock sum differing from a horizontal or vertical neighbor subblock sum by more than one 1
81, 459, 2601, 15759, 95481, 586791, 3606201, 22235391, 137100681, 845893287, 5219051049, 32205712671, 198734965209, 1226388884391, 7568017506009, 46702383172479, 288201314579049, 1778498201192679, 10975161082334409 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A183971

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

FORMULA

Empirical: a(n)=6*a(n-1)+6*a(n-3)+81*a(n-4)-468*a(n-5)-72*a(n-6)-432*a(n-8)+1728*a(n-9)

EXAMPLE

Some solutions for 3X2

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

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

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

...

...6.......2.......6.......4.......5.......2.......3.......2.......6.......0...

...6.......1.......7.......4.......4.......2.......2.......3.......7.......1...

CROSSREFS

Sequence in context: A253533 A183971 A253526 * A236354 A236349 A334036

Adjacent sequences:  A183960 A183961 A183962 * A183964 A183965 A183966

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 08 2011

STATUS

approved

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Last modified October 27 07:47 EDT 2021. Contains 348272 sequences. (Running on oeis4.)