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A235285 Number of (n+1)X(4+1) 0..3 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 4 (constant stress 1X1 tilings) 1
136, 188, 248, 380, 544, 908, 1400, 2492, 4096, 7628, 13208, 25340, 45664, 89228, 165560, 326972, 619456, 1230668, 2366168, 4715900, 9162784, 18292748, 35811320, 71557052, 140857216, 281583308, 556527128, 1112792060, 2205927904, 4411331468 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A235289

LINKS

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

FORMULA

Empirical: a(n) = 3*a(n-1) +3*a(n-2) -15*a(n-3) +4*a(n-4) +18*a(n-5) -12*a(n-6)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A157714 A165337 A256925 * A282794 A304606 A264951

Adjacent sequences:  A235282 A235283 A235284 * A235286 A235287 A235288

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 05 2014

STATUS

approved

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Last modified October 24 18:08 EDT 2021. Contains 348233 sequences. (Running on oeis4.)