A280483 Number of 4Xn 0..2 arrays with no element unequal to a strict majority of its horizontal and antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.

0, 158, 1939, 15104, 100306, 618883, 3589912, 20094736, 109292013, 581664562, 3041562335, 15676720945, 79831562595, 402387057319, 2010428875456, 9967869656098, 49089654019152, 240315798975781, 1170192251577228

Offset

1,2

Comments

Row 4 of A280480.

Links

R. H. Hardin, Table of n, a(n) for n = 1..131

Example

Some solutions for n=4
..0..0..1..1. .0..0..0..1. .0..0..0..1. .0..0..1..0. .0..0..0..0
..0..1..2..2. .1..0..1..1. .0..0..1..1. .0..1..2..2. .1..1..1..1
..2..2..0..2. .0..1..2..2. .0..2..1..1. .1..2..2..0. .0..1..1..1
..0..0..2..2. .1..2..2..1. .2..0..1..1. .2..2..0..0. .1..1..1..2

Crossrefs

Cf. A280480.

Sequence in context: A270791 A180096 A250996 * A252359 A159418 A159434

Adjacent sequences: A280480 A280481 A280482 * A280484 A280485 A280486

Keyword

nonn

Author

R. H. Hardin, Jan 04 2017

Status

approved