A251375 Number of (n+1)X(2+1) 0..3 arrays with every 2X2 subblock summing to 5 6 or 7

1048, 19644, 385704, 7712232, 155378004, 3140670344, 63575161960, 1287767101980, 26092537560408, 528754534404104, 10715654829290772, 217167872708553784, 4401270254542866296, 89199630453126585356

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