A281657 Number of 5Xn 0..2 arrays with no element equal to more than one of its horizontal, diagonal or antidiagonal neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards.

0, 2894, 104815, 2159590, 48871479, 955490042, 18092139475, 334914604224, 6058290906233, 107920205083282, 1899220467260750, 33088963050484262, 571760413613053121, 9811548539803374962, 167377398458564403677

Offset

1,2

Comments

Row 5 of A281653.

Links

R. H. Hardin, Table of n, a(n) for n = 1..59

Example

Some solutions for n=3
..0..0..0. .0..1..1. .0..1..0. .0..1..1. .0..1..1. .0..1..0. .0..0..1
..1..2..1. .0..2..2. .1..2..0. .1..2..0. .0..0..0. .2..1..0. .1..1..2
..2..0..1. .1..0..0. .1..0..0. .2..0..1. .2..1..0. .2..2..2. .2..0..2
..2..1..2. .0..1..2. .2..2..1. .2..0..1. .0..1..2. .1..1..2. .1..0..2
..0..1..0. .0..1..0. .1..0..1. .2..1..0. .1..2..0. .0..0..2. .1..2..1

Crossrefs

Cf. A281653.

Sequence in context: A235816 A235819 A235575 * A234886 A236655 A235822

Adjacent sequences: A281654 A281655 A281656 * A281658 A281659 A281660

Keyword

nonn

Author

R. H. Hardin, Jan 26 2017

Status

approved