A220964 Equals one maps: number of nX2 binary arrays indicating the locations of corresponding elements equal to exactly one of their king-move neighbors in a random 0..2 nX2 array

2, 8, 40, 176, 744, 3144, 13128, 54424, 224120, 918688, 3750192, 15259608, 61920992, 250704984, 1013136464, 4087826848, 16471855680, 66299538792, 266606574816, 1071240609992, 4301416806848, 17261909388320, 69239867965712

Offset

1,1

Comments

Column 2 of A220967

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Formula

Empirical: a(n) = 6*a(n-1) -3*a(n-2) -22*a(n-3) +15*a(n-4) -36*a(n-5) +36*a(n-6) -16*a(n-7) +4*a(n-8) -8*a(n-9) -40*a(n-10) +32*a(n-11) +4*a(n-12) -16*a(n-13)

Example

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

Crossrefs

Sequence in context: A074092 A003445 A181326 * A231125 A221587 A186947

Adjacent sequences: A220961 A220962 A220963 * A220965 A220966 A220967

Keyword

nonn

Author

R. H. Hardin Dec 27 2012

Status

approved