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A251375 Number of (n+1)X(2+1) 0..3 arrays with every 2X2 subblock summing to 5 6 or 7 1
1048, 19644, 385704, 7712232, 155378004, 3140670344, 63575161960, 1287767101980, 26092537560408, 528754534404104, 10715654829290772, 217167872708553784, 4401270254542866296, 89199630453126585356 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A251381

LINKS

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

FORMULA

Empirical: a(n) = 33*a(n-1) -258*a(n-2) -425*a(n-3) +9681*a(n-4) -20982*a(n-5) -28396*a(n-6) +102584*a(n-7) -55200*a(n-8) -23420*a(n-9) +17424*a(n-10) -528*a(n-11) -576*a(n-12)

EXAMPLE

Some solutions for n=2

..3..2..2....1..2..3....1..3..2....3..2..3....0..3..0....1..2..2....1..2..0

..2..0..2....1..2..0....3..0..1....1..0..2....1..1..2....1..2..0....1..2..1

..3..1..2....1..1..3....2..1..3....1..3..1....1..3..1....1..3..1....1..2..0

CROSSREFS

Sequence in context: A280809 A252307 A236273 * A281033 A337960 A331346

Adjacent sequences:  A251372 A251373 A251374 * A251376 A251377 A251378

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 01 2014

STATUS

approved

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Last modified August 19 18:30 EDT 2022. Contains 356229 sequences. (Running on oeis4.)