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A235099 Number of (n+1)X(n+1) 0..6 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 4, with no adjacent elements equal (constant stress tilted 1X1 tilings) 0
154, 2498, 30312, 304746, 2613410, 20552136, 147069470, 1019570090, 6616067648 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A235107

LINKS

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

EXAMPLE

Some solutions for n=3

..2..3..2..1....4..5..2..5....4..6..3..6....3..2..3..5....3..5..2..5

..3..0..3..6....3..0..1..0....6..4..5..4....0..3..0..6....4..2..3..2

..2..3..2..1....2..3..0..3....4..6..3..6....2..1..2..4....1..3..0..3

..1..6..1..4....3..0..1..0....5..3..4..3....3..6..3..1....2..0..1..0

CROSSREFS

Sequence in context: A160840 A160841 A160853 * A332421 A227977 A282557

Adjacent sequences:  A235096 A235097 A235098 * A235100 A235101 A235102

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 03 2014

STATUS

approved

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Last modified December 7 15:24 EST 2021. Contains 349581 sequences. (Running on oeis4.)