A206061 Number of (n+1)X7 0..3 arrays with every 2X3 or 3X2 subblock having exactly two clockwise edge increases

13136860, 96831504, 910785080, 12877680064, 265284773176, 5567891627984, 116754537442024, 2479065365982264, 52806418768197256, 1108813052472349608, 23532501882819145664, 501209726652483241408, 10524272925089598373776

Offset

1,1

Comments

Column 6 of A206063

Links

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

Formula

Empirical: a(n) = 9491*a(n-3) +213*a(n-5) for n>15

Example

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

Crossrefs

Sequence in context: A343083 A342687 A342688 * A274026 A344924 A344925

Adjacent sequences: A206058 A206059 A206060 * A206062 A206063 A206064

Keyword

nonn

Author

R. H. Hardin Feb 03 2012

Status

approved