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A235084 Number of (n+1)X(5+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
1078, 2002, 3610, 7046, 13446, 27218, 53882, 111782, 226726, 478402, 986794, 2108630, 4404870, 9510434, 20077706, 43752230, 93259894, 205022194, 441124138, 978176486, 2124530262, 4751604194, 10419142682, 23500946774, 52030658038 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 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

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

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

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

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

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

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

CROSSREFS

Sequence in context: A235959 A235570 A278652 * A274234 A023085 A163562

Adjacent sequences:  A235081 A235082 A235083 * A235085 A235086 A235087

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 03 2014

STATUS

approved

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Last modified June 20 04:43 EDT 2021. Contains 345157 sequences. (Running on oeis4.)