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A221355 Sum of neighbor maps: log base 2 of the number of n X n binary arrays indicating the locations of corresponding elements equal to the sum mod 2 of their horizontal, diagonal and antidiagonal neighbors in a random 0..1 n X n array 0
1, 4, 9, 12, 24, 30, 49, 58, 73 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A221356

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A051233 A124623 A220195 * A197681 A197624 A199973

Adjacent sequences:  A221352 A221353 A221354 * A221356 A221357 A221358

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 12 2013

STATUS

approved

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Last modified June 25 04:18 EDT 2019. Contains 324346 sequences. (Running on oeis4.)