A219980 Unmatched value maps: number of nX3 binary arrays indicating the locations of corresponding elements not equal to any horizontal, vertical or antidiagonal neighbor in a random 0..3 nX3 array

4, 42, 316, 2344, 17591, 131978, 989813, 7423785, 55680172, 417613528, 3132193649, 23492146292, 176196298209, 1321511242101, 9911626877788, 74339395862026, 557561926512940, 4181837884123208, 31364709922866499, 235242268065930378

Offset

1,1

Comments

Column 3 of A219985

Links

R. H. Hardin, Table of n, a(n) for n = 1..82

Formula

Empirical: a(n) = 8*a(n-1) -7*a(n-2) +27*a(n-3) -23*a(n-4) +28*a(n-5) -18*a(n-6) -5*a(n-7) +10*a(n-8) -a(n-9) -3*a(n-10) +a(n-11)

Example

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

Crossrefs

Sequence in context: A301943 A219101 A118447 * A321957 A037296 A213103

Adjacent sequences: A219977 A219978 A219979 * A219981 A219982 A219983

Keyword

nonn

Author

R. H. Hardin Dec 02 2012

Status

approved