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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A233691

LINKS

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

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

Adjacent sequences:  A233683 A233684 A233685 * A233687 A233688 A233689

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 14 2013

STATUS

approved

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Last modified November 26 17:52 EST 2021. Contains 349343 sequences. (Running on oeis4.)