A220797 - OEIS

A220797

Equals two maps: number of 4Xn binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal, diagonal and antidiagonal neighbors in a random 0..2 4Xn array

1, 94, 1224, 32507, 602536, 10731537, 183846017

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OFFSET

1,2

COMMENTS

Row 4 of A220794

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

Some solutions for n=3

..0..1..0....0..1..0....1..1..1....1..0..1....0..1..0....0..0..0....0..0..0

..1..1..0....0..0..1....0..0..0....0..0..1....0..1..0....1..0..0....0..0..1

..0..0..0....0..1..0....0..1..0....0..0..0....0..0..0....1..0..1....1..1..0

..0..0..0....0..1..0....0..1..0....0..0..1....0..0..0....1..0..0....0..0..0

CROSSREFS

Sequence in context: A196892 A093294 A107613 * A220961 A218648 A278321

Adjacent sequences: A220794 A220795 A220796 * A220798 A220799 A220800

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 21 2012

STATUS

approved