A233151 Number of n X n 0..2 arrays with no element x(i,j) adjacent to value 2-x(i,j) horizontally or antidiagonally.

3, 24, 432, 17496, 1658232, 367125912, 191184793128, 234385100907480, 677856222475099560, 4627785508146660629232, 74650443539914896103253016, 2846446729148572555427535908448, 256684477494955879310882598953790768

Offset

1,1

Links

R. H. Hardin, Table of n, a(n) for n = 1..17

Example

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

Crossrefs

Diagonal of A233155.

Sequence in context: A065761 A374021 A002832 * A236466 A371126 A185970

Adjacent sequences: A233148 A233149 A233150 * A233152 A233153 A233154

Keyword

nonn

Author

R. H. Hardin, Dec 05 2013

Status

approved