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A233878 Number of (n+1)X(3+1) 0..2 arrays with every 2X2 subblock having the sum of the squares of all six edge and diagonal differences equal to 11 1
240, 1224, 6200, 33656, 178704, 1015656, 5566176, 32573400, 181919416, 1082482200, 6108586496, 36673057320, 208076709744, 1254938417144, 7140038828344, 43162651207096, 245918525589328, 1488348259767656 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A233883

LINKS

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

FORMULA

Empirical: a(n) = 56*a(n-2) -819*a(n-4) +2791*a(n-6) -3096*a(n-8) +961*a(n-10) -84*a(n-12)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

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

CROSSREFS

Sequence in context: A234721 A235212 A235205 * A157766 A268906 A234763

Adjacent sequences:  A233875 A233876 A233877 * A233879 A233880 A233881

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 17 2013

STATUS

approved

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Last modified October 18 18:03 EDT 2021. Contains 348068 sequences. (Running on oeis4.)