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A235251 Number of (n+1)X(1+1) 0..7 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 7, with no adjacent elements equal (constant stress tilted 1X1 tilings) 1
184, 744, 2672, 10820, 39680, 161060, 600928, 2443916, 9247456, 37667316, 144145184, 587867372, 2270003552, 9266785652, 36041646880, 147245616428, 576021402208, 2354746576308, 9255402599456, 37854511615724, 149371395546464 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A235258

LINKS

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

FORMULA

Empirical: a(n) = 43*a(n-2) -617*a(n-4) +3073*a(n-6) -1762*a(n-8) +264*a(n-10)

EXAMPLE

Some solutions for n=4

..0..4....3..1....5..2....6..4....3..4....3..0....4..0....7..2....5..1....6..0

..3..0....1..6....2..6....2..7....7..1....2..6....0..3....4..6....2..5....1..2

..1..5....3..1....4..1....4..2....5..6....7..4....6..2....6..1....4..0....7..1

..6..3....2..7....1..5....1..6....6..0....3..7....0..3....2..4....2..5....5..6

..0..4....4..2....7..4....5..3....0..1....6..3....5..1....5..0....4..0....6..0

CROSSREFS

Sequence in context: A217301 A239457 A235258 * A233676 A234152 A234146

Adjacent sequences:  A235248 A235249 A235250 * A235252 A235253 A235254

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 05 2014

STATUS

approved

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Last modified September 25 20:01 EDT 2021. Contains 347659 sequences. (Running on oeis4.)