A199245 - OEIS

A199245

Number of n X 7 0..2 arrays with values 0..2 introduced in row major order, the number of instances of each value within one of each other, and every element equal to zero or two horizontal or vertical neighbors.

19, 288, 2080, 134821, 3190670, 27337776, 2013526831, 52332203186

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions for n=4:

..0..1..0..1..0..0..2....0..1..0..2..0..2..1....0..1..0..2..0..1..2

..2..0..1..2..0..0..1....1..0..1..0..2..1..2....1..0..2..0..1..2..0

..0..2..0..1..1..2..2....0..2..0..2..1..2..1....0..1..0..1..2..0..2

..1..0..2..1..1..2..2....2..0..1..0..2..1..2....1..2..1..2..1..2..0

CROSSREFS

Column 7 of A199246.

Sequence in context: A081045 A155017 A386956 * A152591 A051562 A330846

Adjacent sequences: A199242 A199243 A199244 * A199246 A199247 A199248

KEYWORD

nonn,more

AUTHOR

R. H. Hardin, Nov 04 2011

STATUS

approved