A222979 Number of n X n 0..2 arrays with no more than floor(n X n/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..2 order

1, 4, 43, 4572, 601407, 850056406, 1202086792105, 17754195762507497, 260868222546366365309, 39377828973385121921770236

Offset

1,2

Comments

Diagonal of A222986

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Sequence in context: A355081 A176827 A220675 * A284192 A278798 A102388

Adjacent sequences: A222976 A222977 A222978 * A222980 A222981 A222982

Keyword

nonn

Author

R. H. Hardin Mar 11 2013

Status

approved