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A235313 Number of (n+1)X(2+1) 0..6 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 7 (constant stress 1X1 tilings) 1
392, 1120, 2744, 8392, 22568, 71896, 206360, 675064, 2026472, 6751000, 20907224, 70560952, 223435688, 761260696, 2450452760, 8407382584, 27402409832, 94504374040, 311023311704, 1076774857912, 3571073152808, 12398475609496 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A235319

LINKS

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

FORMULA

Empirical: a(n) = 4*a(n-1) +47*a(n-2) -200*a(n-3) -901*a(n-4) +4204*a(n-5) +8957*a(n-6) -48440*a(n-7) -47194*a(n-8) +334096*a(n-9) +101948*a(n-10) -1410080*a(n-11) +170136*a(n-12) +3549696*a(n-13) -1446912*a(n-14) -4861440*a(n-15) +2954880*a(n-16) +2764800*a(n-17) -2073600*a(n-18)

EXAMPLE

Some solutions for n=4

..5..1..5....4..0..3....4..0..4....5..0..4....2..6..0....0..4..0....5..1..5

..2..5..2....1..4..0....2..5..2....1..3..0....5..2..3....5..2..5....0..3..0

..5..1..5....6..2..5....4..0..4....6..1..5....2..6..0....0..4..0....4..0..4

..0..3..0....2..5..1....0..3..0....2..4..1....6..3..4....5..2..5....1..4..1

..5..1..5....6..2..5....6..2..6....5..0..4....2..6..0....1..5..1....5..1..5

CROSSREFS

Sequence in context: A235188 A248022 A261379 * A203917 A180295 A166988

Adjacent sequences:  A235310 A235311 A235312 * A235314 A235315 A235316

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 05 2014

STATUS

approved

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Last modified January 22 11:21 EST 2021. Contains 340362 sequences. (Running on oeis4.)