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A234489 Number of (n+1)X(7+1) 0..3 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 2 (constant stress 1X1 tilings) 1
220334, 765738, 2659824, 9288710, 32545706, 114484712, 404043442, 1431125914, 5084793448, 18127421166, 64813774926, 232475602952, 836155485018, 3016451992646, 10910475434292, 39574863492918, 143905533079266 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A234490

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..34

EXAMPLE

Some solutions for n=1

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

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

CROSSREFS

Sequence in context: A257207 A204968 A294014 * A321160 A223369 A254509

Adjacent sequences:  A234486 A234487 A234488 * A234490 A234491 A234492

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 26 2013

STATUS

approved

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Last modified August 25 16:17 EDT 2019. Contains 326324 sequences. (Running on oeis4.)