A220958 - OEIS

A220958

Equals two maps: number of nX4 binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal, diagonal and antidiagonal neighbors in a random 0..3 nX4 array

4, 76, 1769, 33708, 590009, 10032271, 165226050, 2688227848

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OFFSET

1,1

COMMENTS

Column 4 of A220959

LINKS

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

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A214814 A144210 A220793 * A187542 A364111 A009631

Adjacent sequences: A220955 A220956 A220957 * A220959 A220960 A220961

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 26 2012

STATUS

approved