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A235231 Number of (n+1)X(n+1) 0..6 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 6, with no adjacent elements equal (constant stress tilted 1X1 tilings) 0
120, 1288, 9656, 77368, 496520, 3512000, 21123784, 140450408, 822331208, 5291121256 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A235239

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A052765 A265091 A259519 * A167549 A052776 A052770

Adjacent sequences:  A235228 A235229 A235230 * A235232 A235233 A235234

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 05 2014

STATUS

approved

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Last modified June 16 21:55 EDT 2021. Contains 345080 sequences. (Running on oeis4.)