A234913 - OEIS

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A234913

Number of (n+1) X (n+1) 0..4 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 2, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings).

40, 360, 3684, 55492, 991144, 28854040, 911837036, 56108159524, 3092040129896

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

OFFSET

1,1

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

Some solutions for n=4:

3 2 1 2 1 0 3 2 1 0 1 4 3 0 1 2 1 2 1 0

2 3 0 3 4 3 4 1 2 3 2 3 4 3 2 3 4 3 0 1

3 2 1 2 1 0 3 2 1 0 1 0 3 0 1 2 1 2 1 4

4 1 2 1 2 1 2 3 4 1 2 3 4 3 2 3 4 3 0 1

1 0 3 4 3 2 1 4 3 2 1 4 3 0 1 4 3 4 3 2

CROSSREFS

Diagonal of A234921.

Sequence in context: A247407 A251431 A285919 * A190312 A229532 A252180

Adjacent sequences: A234910 A234911 A234912 * A234914 A234915 A234916

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 01 2014

STATUS

approved