A220803 Sum of neighbor maps: number of nX4 binary arrays indicating the locations of corresponding elements equal to the sum mod 4 of their horizontal and vertical neighbors in a random 0..3 nX4 array.

16, 256, 4096, 62648, 1048576, 16777216, 268435456, 4294967296, 68700598768, 1099511627776, 17592186044416, 281474976710656, 4503599627370496, 72057490800855040, 1152921504606846976

Offset: 1

Author

R. H. Hardin Dec 21 2012

Keywords

• nonn

Comments

Column 4 of A220805

Examples

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