A230700 Number of (n+3)X(n+3) 0..2 white square subarrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero

2, 28, 2106, 121382, 43853402, 13663471254, 26681634560690, 45145901233869558, 479398570293769095556, 4408105907275837627631446

Offset

1,1

Comments

Diagonal of A230708

Links

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

Example

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

Crossrefs

Sequence in context: A355070 A326366 A177400 * A168554 A152792 A085602

Adjacent sequences: A230697 A230698 A230699 * A230701 A230702 A230703

Keyword

nonn

Author

R. H. Hardin, Oct 28 2013

Status

approved