A233878 - OEIS

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

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