A230941 - OEIS

A230941

Number of (n+3)X(n+3) 0..3 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 4, and upper left element zero

6, 34, 8374, 606224, 584293702, 295706164414, 2042677948725090

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

OFFSET

1,1

COMMENTS

Diagonal of A230949

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

Some solutions for n=2

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

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

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

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

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

CROSSREFS

Sequence in context: A161323 A003423 A230936 * A359571 A145000 A354792

Adjacent sequences: A230938 A230939 A230940 * A230942 A230943 A230944

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 01 2013

STATUS

approved