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A235299 Number of (n+1)X(9+1) 0..3 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 3 (constant stress 1X1 tilings) 1
96640, 104988, 115952, 138744, 172288, 242592, 358016, 603216, 1044640, 2006448, 3872192, 8117424, 16889248, 38126832, 84508736, 205202736, 481284640, 1249786608, 3069367232, 8404486704, 21326389408, 60552997872, 156864001856 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 9 of A235301

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..25

FORMULA

Empirical: a(n) = 3*a(n-1) +17*a(n-2) -57*a(n-3) -86*a(n-4) +372*a(n-5) +76*a(n-6) -972*a(n-7) +360*a(n-8) +864*a(n-9) -576*a(n-10)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

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

CROSSREFS

Sequence in context: A224569 A224570 A224577 * A186013 A102868 A253618

Adjacent sequences:  A235296 A235297 A235298 * A235300 A235301 A235302

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 05 2014

STATUS

approved

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Last modified August 5 08:27 EDT 2021. Contains 346464 sequences. (Running on oeis4.)