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A233983 Number of (n+1)X(2+1) 0..4 arrays with every 2X2 subblock having the sum of the squares of the edge differences equal to 10, and no two adjacent values equal 1
236, 1540, 9632, 62040, 393396, 2520604, 16042420, 102569896, 653740236, 4175880380, 26632556736, 170044378852, 1084833846436, 6924940011112, 44186146407404, 282025989515940, 1799679817590096, 11486087605706420 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A233989

LINKS

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

FORMULA

Empirical: a(n) = 3*a(n-1) +53*a(n-2) -116*a(n-3) -892*a(n-4) +1620*a(n-5) +5804*a(n-6) -9766*a(n-7) -13812*a(n-8) +23148*a(n-9) +8224*a(n-10) -16848*a(n-11) +2560*a(n-12) +256*a(n-13)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A273181 A259639 A334649 * A251491 A251484 A247475

Adjacent sequences:  A233980 A233981 A233982 * A233984 A233985 A233986

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 18 2013

STATUS

approved

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Last modified October 25 11:12 EDT 2021. Contains 348246 sequences. (Running on oeis4.)