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A234485 Number of (n+1)X(3+1) 0..3 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 2 (constant stress 1X1 tilings) 1
944, 3540, 13260, 49784, 187196, 705072, 2659824, 10049936, 38030588, 144134184, 547062036, 2079436784, 7915312712, 30172181304, 115169444940, 440212045280, 1684837886252, 6456944580816, 24776948509056, 95196417683360 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A234490

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 13*a(n-1) -43*a(n-2) -107*a(n-3) +865*a(n-4) -1033*a(n-5) -1916*a(n-6) +2822*a(n-7) +2712*a(n-8) -1332*a(n-9) -1512*a(n-10) -288*a(n-11)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

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

CROSSREFS

Sequence in context: A252294 A268268 A106431 * A260136 A215838 A145493

Adjacent sequences:  A234482 A234483 A234484 * A234486 A234487 A234488

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 26 2013

STATUS

approved

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Last modified August 25 13:50 EDT 2019. Contains 326324 sequences. (Running on oeis4.)