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A235287 Number of (n+1) X (6+1) 0..3 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 4 (constant stress 1 X 1 tilings). 1
472, 572, 680, 908, 1168, 1724, 2408, 3884, 5872, 10172, 16520, 30188, 52048, 98684, 178088, 345644, 644272, 1267772, 2415560, 4789868, 9261328, 18440444, 36008168, 71852204, 141250672, 282173372, 557313800, 1113971948, 2207501008, 4413691004 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 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

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

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

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

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

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

CROSSREFS

Cf. A235289.

Sequence in context: A034284 A345545 A345798 * A260102 A260135 A259640

Adjacent sequences:  A235284 A235285 A235286 * A235288 A235289 A235290

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 05 2014

STATUS

approved

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Last modified December 4 19:40 EST 2021. Contains 349526 sequences. (Running on oeis4.)