A205984 Number of (n+1)X7 0..2 arrays with every 2X3 or 3X2 subblock having exactly two clockwise edge increases

315357, 591336, 1599096, 7793856, 50843904, 338009472, 2260666464, 15125213376, 101283221088, 678162489984, 4537566722304, 30384966326400, 203448746995200, 1361270016691200, 9115489897920000, 61034624098560000, 408381005007360000

Offset

1,1

Comments

Column 6 of A205986

Links

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

Formula

Empirical: a(n) = 300*a(n-3) for n>11

Example

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

Crossrefs

Sequence in context: A092014 A250501 A234656 * A253748 A253755 A309238

Adjacent sequences: A205981 A205982 A205983 * A205985 A205986 A205987

Keyword

nonn

Author

R. H. Hardin Feb 02 2012

Status

approved