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A233910 Number of (n+1)X(1+1) 0..7 arrays with every 2X2 subblock having the sum of the squares of the edge differences equal to 30, and no two adjacent values equal 1
160, 640, 2440, 9612, 36976, 145004, 559736, 2189924, 8470344, 33088100, 128155456, 500055876, 1938715672, 7558416852, 29325538832, 114258452900, 443550616168, 1727342374724, 6708320872096, 26115152683348, 101452849075768 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A233917

LINKS

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

FORMULA

Empirical: a(n) = 24*a(n-2) +6*a(n-3) -177*a(n-4) -52*a(n-5) +516*a(n-6) +80*a(n-7) -646*a(n-8) +42*a(n-9) +284*a(n-10) -80*a(n-11)

EXAMPLE

Some solutions for n=5

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

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

..2..6....2..5....4..6....2..6....3..6....2..5....4..5....7..3....3..7....4..6

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

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

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

CROSSREFS

Sequence in context: A184070 A278122 A233917 * A234658 A234651 A234898

Adjacent sequences:  A233907 A233908 A233909 * A233911 A233912 A233913

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 17 2013

STATUS

approved

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Last modified October 20 00:57 EDT 2021. Contains 348099 sequences. (Running on oeis4.)