A220405 Equals two maps: number of n X 5 binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal, diagonal and antidiagonal neighbors in a random 0..1 n X 5 array.

7, 93, 6013, 128448, 2996186, 74035199

Offset

1,1

Comments

Column 5 of A220406.

Links

Table of n, a(n) for n=1..6.

Example

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

Crossrefs

Cf. A220406.

Sequence in context: A197484 A218835 A219417 * A109304 A134113 A071584

Adjacent sequences: A220402 A220403 A220404 * A220406 A220407 A220408

Keyword

nonn

Author

R. H. Hardin, Dec 13 2012

Status

approved