A230246 - OEIS

A230246

Number of nX3 0..3 arrays x(i,j) with each element horizontally or vertically next to at least one element with value (x(i,j)+1) mod 4, and upper left element zero

0, 6, 34, 514, 5838, 64838, 722386, 8040426, 89496950, 996201406, 11088801786, 123430533890, 1373917986238, 15293224744246, 170230491719618, 1894853512698394, 21091813842617094, 234775199414692462

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

OFFSET

1,2

COMMENTS

Column 3 of A230250

LINKS

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

FORMULA

Empirical: a(n) = 19*a(n-1) -112*a(n-2) +308*a(n-3) -443*a(n-4) +531*a(n-5) -1290*a(n-6) +2646*a(n-7) -1150*a(n-8) -3528*a(n-9) +4044*a(n-10) -384*a(n-11) +752*a(n-12) -384*a(n-13)

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A284330 A125759 A062819 * A092336 A262104 A161323

Adjacent sequences: A230243 A230244 A230245 * A230247 A230248 A230249

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 13 2013

STATUS

approved