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A233686
Number of (n+1)X(3+1) 0..3 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
356, 2628, 19248, 145512, 1095164, 8284072, 62569964, 473123164, 3575792884, 27033634800, 204346864164, 1544799897832, 11677617006096, 88277308600968, 667323988066868, 5044620581563464, 38134490738693688, 288276154246399008
OFFSET
1,1
COMMENTS
Column 3 of A233691
LINKS
FORMULA
Empirical: a(n) = 7*a(n-1) +30*a(n-2) -198*a(n-3) -190*a(n-4) +1708*a(n-5) +65*a(n-6) -6015*a(n-7) +1916*a(n-8) +9134*a(n-9) -3808*a(n-10) -5930*a(n-11) +2155*a(n-12) +1461*a(n-13) -312*a(n-14) -112*a(n-15)
EXAMPLE
Some solutions for n=4
..0..1..3..2....2..1..3..1....2..0..1..2....0..1..0..1....1..2..1..2
..2..0..1..0....0..2..1..2....3..1..3..1....2..0..2..3....2..0..2..0
..1..2..3..2....1..0..2..0....2..3..2..3....0..1..3..1....3..2..3..2
..2..0..1..0....3..2..3..2....0..2..0..2....2..3..2..0....2..0..1..3
..0..1..3..2....1..3..1..3....1..3..2..1....3..1..3..1....1..2..3..2
CROSSREFS
Sequence in context: A232298 A108375 A237466 * A231078 A232851 A223428
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 14 2013
STATUS
approved