A230936 - OEIS

A230936

Number of white-square subarrays of (n+2) X (n+2) 0..3 arrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 4, no adjacent elements equal, and upper left element zero.

0, 6, 34, 1242, 28216, 4092246, 318984080, 159130979900, 43562979789278, 76371552378548280, 73355302704339455588

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

Diagonal of A230940.

LINKS

Table of n, a(n) for n=1..11.

EXAMPLE

Some solutions for n=4

..0..x..2..x..0..x....0..x..0..x..0..x....0..x..2..x..2..x....0..x..2..x..0..x

..x..1..x..3..x..1....x..1..x..1..x..3....x..1..x..3..x..1....x..1..x..3..x..1

..0..x..2..x..2..x....2..x..2..x..0..x....0..x..2..x..0..x....0..x..2..x..2..x

..x..3..x..1..x..1....x..3..x..1..x..3....x..3..x..3..x..1....x..1..x..1..x..1

..2..x..0..x..2..x....0..x..2..x..0..x....2..x..0..x..2..x....0..x..0..x..0..x

..x..3..x..3..x..1....x..1..x..1..x..3....x..1..x..3..x..1....x..3..x..3..x..3

CROSSREFS

Cf. A230940.

Sequence in context: A262104 A161323 A003423 * A230941 A359571 A145000

Adjacent sequences: A230933 A230934 A230935 * A230937 A230938 A230939

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 01 2013

STATUS

approved