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A234486 Number of (n+1)X(4+1) 0..3 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 2 (constant stress 1X1 tilings) 1
3686, 13554, 49784, 183422, 677138, 2505400, 9288710, 34509914, 128461544, 479146446, 1790472578, 6703375016, 25141441190, 94466340970, 355552667288, 1340563920974, 5062700401010, 19151478723096, 72561523035974 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A234490

LINKS

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

FORMULA

Empirical: a(n) = 16*a(n-1) -69*a(n-2) -186*a(n-3) +2233*a(n-4) -3610*a(n-5) -15789*a(n-6) +56088*a(n-7) +1729*a(n-8) -189898*a(n-9) +95019*a(n-10) +304674*a(n-11) -145486*a(n-12) -269396*a(n-13) +58980*a(n-14) +118584*a(n-15) +6480*a(n-16) -16992*a(n-17) -3456*a(n-18)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A252311 A263814 A179130 * A097500 A186198 A188155

Adjacent sequences:  A234483 A234484 A234485 * A234487 A234488 A234489

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 26 2013

STATUS

approved

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Last modified July 18 11:36 EDT 2019. Contains 325138 sequences. (Running on oeis4.)