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A235086 Number of (n+1)X(7+1) 0..4 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 4, with no adjacent elements equal (constant stress tilted 1X1 tilings) 1
5786, 9838, 16390, 29970, 53882, 103702, 196302, 390578, 764386, 1553646, 3106158, 6403898, 12986378, 27053230, 55429622, 116456530, 240620906, 509472502, 1060761214, 2263211058, 4748262482, 10211045710, 21595163358, 46827642938 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A235087

LINKS

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

FORMULA

Empirical: a(n) = 6*a(n-1) +4*a(n-2) -87*a(n-3) +90*a(n-4) +450*a(n-5) -830*a(n-6) -936*a(n-7) +2737*a(n-8) +408*a(n-9) -4078*a(n-10) +891*a(n-11) +2766*a(n-12) -816*a(n-13) -904*a(n-14) +180*a(n-15) +120*a(n-16)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

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

CROSSREFS

Sequence in context: A004953 A004973 A114361 * A098476 A248132 A238553

Adjacent sequences:  A235083 A235084 A235085 * A235087 A235088 A235089

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 03 2014

STATUS

approved

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Last modified June 17 15:38 EDT 2021. Contains 345085 sequences. (Running on oeis4.)