A218844 Unmatched value maps: number of 3Xn binary arrays indicating the locations of corresponding elements not equal to any horizontal or antidiagonal neighbor in a random 0..1 3Xn array

1, 21, 93, 453, 2050, 9516, 44129, 204780, 950346, 4410194, 20465923, 94974721, 440743516, 2045330613, 9491634200, 44047218242, 204407115009, 948579057090, 4402010267626, 20428127976053, 94799509246526, 439930030199648

Offset

1,2

Comments

Row 3 of A218842

Links

R. H. Hardin, Table of n, a(n) for n = 1..53

Example

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

Crossrefs

Sequence in context: A254603 A144856 A065522 * A219423 A123213 A296822

Adjacent sequences: A218841 A218842 A218843 * A218845 A218846 A218847

Keyword

nonn

Author

R. H. Hardin Nov 07 2012

Status

approved