A210261 Number of (n+1)X3 0..3 arrays containing all values 0..3 with every 2X2 subblock having three distinct values, and new values 0..3 introduced in row major order

29, 1039, 25901, 592969, 13233079, 292930403, 6467110597, 142651105201, 3145676312903, 69360351853819, 1529307333302941, 33718923388205609, 743448896978561935, 16391852782863165859, 361413860134081682837

Offset

1,1

Comments

Column 2 of A210267

Links

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

Formula

Empirical: a(n) = 32*a(n-1) -225*a(n-2) +2856*a(n-4) -2952*a(n-5) -4100*a(n-6) +3664*a(n-7) -384*a(n-8)

Example

Some solutions for n=4
..0..1..1....0..0..0....0..0..0....0..0..1....0..0..1....0..0..0....0..0..0
..2..0..2....1..2..3....1..2..1....2..1..2....1..2..0....1..2..1....1..2..3
..0..1..0....3..2..1....0..0..0....0..0..1....3..3..2....2..3..1....0..1..2
..3..3..3....1..1..3....1..2..1....1..2..1....0..1..2....1..3..2....1..3..1
..1..2..1....3..0..1....3..3..1....1..3..3....1..2..3....3..0..2....0..1..0

Crossrefs

Sequence in context: A218635 A218239 A132058 * A138660 A237356 A176695

Adjacent sequences: A210258 A210259 A210260 * A210262 A210263 A210264

Keyword

nonn

Author

R. H. Hardin Mar 19 2012

Status

approved