A223107 Number of 4Xn 0..2 arrays with exactly floor(4Xn/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..2 order.

0, 280, 13416, 737254, 40395409, 2222762597, 123093376161, 6858519798139, 384184470564745, 21618570758835696, 1221246943086629366, 69219708062618487810, 3934674396591601892887, 224222135757151794516896

Offset

1,2

Comments

Row 4 of A223104

Links

R. H. Hardin, Table of n, a(n) for n = 1..25

Example

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

Crossrefs

Sequence in context: A024214 A357248 A094895 * A218411 A272715 A282439

Adjacent sequences: A223104 A223105 A223106 * A223108 A223109 A223110

Keyword

nonn

Author

R. H. Hardin, Mar 14 2013

Status

approved