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A234983 Number of (n+1)X(n+1) 0..5 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 2, with no adjacent elements equal (constant stress tilted 1X1 tilings) 0
90, 1490, 34608, 1525462, 128653892, 24740904388, 10857686727324, 11461385380110162 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A234991

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions for n=3

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

..0..3..1..4....3..4..1..4....4..3..4..1....0..4..1..4....1..0..1..4

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

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

CROSSREFS

Sequence in context: A133350 A279438 A250869 * A166817 A166799 A001561

Adjacent sequences:  A234980 A234981 A234982 * A234984 A234985 A234986

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 02 2014

STATUS

approved

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Last modified September 18 13:54 EDT 2021. Contains 347527 sequences. (Running on oeis4.)