A206232 Number of (n+1)X3 0..3 arrays with every 2X3 or 3X2 subblock having exactly two equal edges, and new values 0..3 introduced in row major order

60, 256, 1136, 5728, 31652, 170728, 943584, 5175034, 28475596, 156707492, 861735284, 4742758462, 26087819020, 143545024690, 789722083016, 4344918701514, 23904948840000, 131519096655384, 723594734816028

Offset

1,1

Comments

Column 2 of A206238

Links

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

Formula

Empirical: a(n) = 3*a(n-1) +20*a(n-2) -14*a(n-3) -133*a(n-4) +95*a(n-5) +123*a(n-6) +9*a(n-7) -102*a(n-8) for n>10

Example

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

Crossrefs

Sequence in context: A261970 A206144 A008428 * A075295 A189542 A134587

Adjacent sequences: A206229 A206230 A206231 * A206233 A206234 A206235

Keyword

nonn

Author

R. H. Hardin Feb 05 2012

Status

approved