A223105 Number of 2Xn 0..2 arrays with exactly floor(2Xn/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..2 order

0, 6, 24, 225, 1456, 11874, 86726, 681306, 5213490, 40813074, 318018986, 2499530547, 19657584586, 155231158734, 1227855690342, 9736016121693, 77325805291432, 615206556468342, 4901472503744342, 39103441462583022

Offset

1,2

Comments

Row 2 of A223104

Links

R. H. Hardin, Table of n, a(n) for n = 1..29

Example

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

Crossrefs

Sequence in context: A277985 A091097 A231317 * A112675 A052583 A052671

Adjacent sequences: A223102 A223103 A223104 * A223106 A223107 A223108

Keyword

nonn

Author

R. H. Hardin Mar 14 2013

Status

approved