A206201 Number of (n+1)X4 0..3 arrays with every 2X3 or 3X2 subblock having exactly one clockwise edge increases

1768, 3008, 5136, 11832, 27400, 60800, 145208, 346080, 775944, 1799656, 4265112, 9666256, 22287416, 52569856, 120132224, 276283624, 648644008, 1490750392, 3426149328, 8010922248, 18480112640, 42488361472, 99015558792, 228939593928

Offset

1,1

Comments

Column 3 of A206206

Links

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

Formula

Empirical: a(n) = 10*a(n-3) +5*a(n-4) +a(n-5) +2*a(n-8) +2*a(n-10) for n>18

Example

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

Crossrefs

Sequence in context: A031672 A031540 A135795 * A237900 A221118 A155023

Adjacent sequences: A206198 A206199 A206200 * A206202 A206203 A206204

Keyword

nonn

Author

R. H. Hardin Feb 04 2012

Status

approved