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A235169 Number of (n+1)X(1+1) 0..7 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
268, 1528, 8688, 49464, 281580, 1603344, 9129276, 51991032, 296077680, 1686409896, 9605163060, 54717521520, 311695967268, 1775889808968, 10117725689808, 57654052582296, 328516960925484, 1872258361831056 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A235175

LINKS

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

FORMULA

Empirical: a(n) = 6*a(n-1) +37*a(n-2) -234*a(n-3) -141*a(n-4) +1290*a(n-5) +108*a(n-6) -2340*a(n-7) +1296*a(n-9)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A237228 A190352 A235175 * A251941 A286792 A115183

Adjacent sequences:  A235166 A235167 A235168 * A235170 A235171 A235172

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 04 2014

STATUS

approved

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Last modified October 15 19:25 EDT 2019. Contains 328037 sequences. (Running on oeis4.)